Do you have any work or school account connected?
If yes, your admin might have applied a policy setting to restrict access to Store app.
Here's an explanation about this:
https://learn.microsoft.com/en-us/windows/configuration/store/?tabs=intune
If no, you can try this:
- Open Group Policy Editor using
gpedit.msccommand. - Go to Computer Configuration > Administrative Templates > Windows Components > Store.
- Set the Turn off the Store application policy setting to Disabled.
- Click Apply, OK.
- Restart your system.
If you need detailed steps, refer this fix:
https://www.kapilarya.com/solved-microsoft-store-blocked-by-administrator-in-windows-11
Let us know if this helps!
Note: Included link in this reply refers to blog post by a trusted Microsoft MVP.