Windows 11 account issues: lock screen skipped, device not showing in Microsoft account

Hi everyone,

I’m facing a few strange issues on Windows 11 that seem to be limited only to my main user profile, and I’m hoping to fix them without creating a new profile and migrating all my data.

1. Settings > Apps > Advanced app settings: I see a sign-in-related issue & an error code 0x80860010.
2. The lock screen is skipped when the PC starts. On power-on or restart, the lock screen flashes for a split second, and then Windows directly goes to the PIN entry screen. This happens only on my main user account. If I create a new local or Microsoft account, the lock screen works perfectly even after a restart or cold boot. 
3. My Windows PC does not appear under Devices on my Microsoft account page, even though the PC is signed in with my Microsoft account locally.
   
   I’ve already tried restarting, signing out and back into my Microsoft account, checking sign-in options, and testing Fast Startup on and off. Since everything works fine on newly created accounts, I believe my existing user profile or account state may be corrupted.
   
   I’m trying to avoid creating a new profile and manually migrating data if possible. Any guidance on repairing the current user profile, re-linking the device to my Microsoft account, or restoring normal lock screen behavior would be greatly appreciated.
   Thanks in advance for any help.
   ~Gourav