Error 0x8000ffff prevents you from using the Microsoft store. Altho it is not a critical error that will break Windows, it is annoying enough that will require fixing so we can use the store once again and install apps when we want to. Interesting thing is that this error was present inside Windows 10 as well causing some annoyance, you think Microsoft would learn, and then you see reality. Anyway, we have not come here to bash Microsoft, we came to solve errors.
So there are several problems that can cause this error like issues with accessing the Microsoft servers, corrupt system files, settings being misconfigured, malware infections, or conflicting applications. We will cover all solutions for each scenario taking approaches from most simple solutions to more complex ones. Follow the guide and let's fix this annoyance.
Wait for Microsoft's servers to become accessible
Yes, just wait. If the problem is tied to Microsoft servers having heavy load or being temporarily down there is not much you can do except for their tech team to resolve the issue. Go to Twitter or Facebook and check the Microsoft page to see if anyone else has this issue, if several people are reporting the same error then it is due to server problems. In this case, the only thing you can do is to wait.
Run troubleshooter
If servers are working fine then the issue is within your system so let's get down to fixing. Most simple and easiest solution is to let Windows try and resolve the problem by itself. We will use troubleshooter for this, Windows's integrated fixing solution:
Press
⊞ WINDOWS +
I to open the
settings app
Click on
System in the left panel, then on
Troubleshoot on the right
Click on
Other troubleshooters
In
most Frequent section find
Windows Update and click on the
Run button
Wait for the troubleshooter to finish and follow on-screen instructions
Clear Store cache
If the troubleshooter has not found the issue or was unable to repair it, the next step is cleaning the Microsoft store cache in order to eliminate corrupted or partial cache files.
Press
⊞ WINDOWS +
R to open the
run dialog
In run dialog type in:
wsreset and press
OK or press
ENTER
A black screen will appear and it will not give any kind of feedback about progress, so it might seem like Windows has frozen, but do not panic nor try to do anything, this kind of behavior is normal, just wait for the process to finish and once it is done Microsoft store will launch with the cleared cache.
Disable Proxy
Proxy setting can interfere with establishing a connection to the store servers and if previous solutions have not worked we will check proxy next.
Press
⊞ WINDOWS +
R to open the
run dialog
Inside run dialog type:
inetcpl.cpl and hit
ENTER or press
OK button
Inside
Internet Properties click on the
Connections tab and then on
LAN settings
Uncheck the box next to
Use a proxy server for your LAN and click on
OK
Turn off antivirus
If nothing worked so far, turn off your anti-virus software, there is a slight possibility that your antivirus is misconfigured or preventing the system from accessing the store. Turn off antivirus and firewall to make sure that this is not an issue.
Delete the software distribution folder
So, we have tried a lot of things, and the error still persists? Let's then go to the next step and delete the software distribution folder in order to be remade new so we can eliminate corruption in the folder itself. To do this follow the guide:
Press
⊞ WINDOWS +
S to open the
search menu
Inside search type in
Windows terminal, right-click on the terminal and click on
Run as administrator.
Confirm with
YES on
UAC prompt pop up
Inside terminal press
CTRL +
SHIFT +
2 to open
command prompt
inside command prompt type in:
net stop wuauserv and press
ENTER
Then type in:
net stop bits followed with
ENTER
Next press
⊞ WINDOWS +
R to open the
run dialog
Inside run dialog type in
C:\Windows\SoftwareDistribution and press the
OK button or
ENTER
File Explorer will open and you will find yourself inside
SoftwareDistribution folder. Press
CTRL +
A to select all files inside
Press on the
delete icon or press
DEL, confirm with
YES
Once all files are deleted, the system will redownload new ones.
Enable Cryptographic service
Windows 11 has come with a cryptographic service that aims to make your computer more secure but if the service is turned off it can be the cause of 0x8000ffff error. In order to turn this service back ON, follow the guide:
Press
⊞ WINDOWS +
R to open the
run dialog
In
run dialog type in
services.msc and press
ENTER or click on the
OK button
In the list find
Cryptographic Services and double click on it
Inside
properties click on
Startup type dropdown menu and select
Automatic from the list
Click on the
Start button to run service and then on the
OK button to save the changes
Run SFC scan
SFC is an internal Windows tool for fixing corrupt system files, application will scan all system files and repair ones that are corrupted. To run an SFC scan do the following:
Press
⊞ WINDOWS +
S to open the
search menu
Inside search type in
Windows terminal, right-click on the terminal and click on
Run as administrator.
Confirm with
YES on
UAC prompt pop up
Inside terminal press
CTRL +
SHIFT +
2 to open
command prompt
inside command prompt type in:
SFC /scannow and press
ENTER
Wait for the whole process to finish and reboot your system
Run DISM scan
Similar to SFC, DISM scan will scan your system Windows image and if required it will repair it.
Press
⊞ WINDOWS +
S to open the
search menu
Inside search type in
Windows terminal, right-click on the terminal and click on
Run as administrator.
Confirm with
YES on
UAC prompt pop up
Inside terminal press
CTRL +
SHIFT +
2 to open
command prompt
inside command prompt type in:
DISM /Online /Cleanup-Image /RestoreHealth and press
ENTER
Wait for the whole process to finish and restart your computer
When the settings window opens, choose ACCOUNTS on it.
Windows will then go to the accounts settings page. Within that page, click on the Family & other users to open the setting for the chosen section on right. On the right settings, screen navigate to the lower section and click once with the left button on add someone else to this PC
When add someone else to this PC is clicked, pop up window will appear which will ask you to provide the persons email address and later on the password of his/her Microsoft account, after the required information is provided you are done, a new user has been added and he can use his Microsoft credentials on the login screen to use this computer.
This will open yet another pop-up giving you the option to create a Microsoft account for this person, to use a phone number instead of a Microsoft account, or to create a new email address for the user. Any of these options will create a new user for this computer with provided credentials but there is the last option at bottom of the pop-up which will allow you to create a local user only without a Microsoft account. This user will be able to use this computer, will not be able to transfer his document through various devices like he/she would if using a valid Microsoft account but it could use the computer and personalize it fully to his/her liking.
Once the link is clicked, you will be presented with a floating window requiring you to input needed information in order for the account to be created. You will need to provide username, password, and answers to 3 security questions.
Once all information has been provided, click on next and your new non-Microsoft local user has been created. Now when you click on Family & other users you will see that Windows has added a new user with the provided name to this computer. If you wish, you can add another user in the same manner, following the previous steps. Microsoft Windows does not have a limit for how many users can be on one computer so feel free to create as many as you like.
Click on Change account type.
Under account type, you will have the option to promote this user to an administrator if you wish or you can leave it as a standard user. 
For anyone who is not aware, when Windows 11 was released if you wanted to switch to another browser you had to go into the settings app and choose the default browser for different types of file extensions like HTML, HTM, PDF for opening on the web, etc. Of course, this was completely unnecessary and it was not well received by users. So after some time, Microsoft backpedaled to standard one click, choose your default browser solution that existed in the previous version of Windows OS.
Altho sometimes Microsoft knows how to irritate its users base, it is good to know that they can also listen and fix things that are required. 
