User signed out MCC

try rebooting your console

check on xbox.com as well and see what gives

Hello, My name is Jesse. I'm an Independent Advisor and a member of the Microsoft community and I'd love to assist you today.

Sign into Xbox.com and check the details of your account. If everything checks out, sign out of Halo MCC and sign back in to see if that makes a difference

Try this.

Navigate to your local AppData's webcache folder at C:\Users\YourUserNameHere\AppData\LocalLow\MCC\Saved\webcache

Alternatively, paste this into your explorer window bar: %userprofile%\AppData\LocalLow\MCC\Saved\webcache

Delete all files in this location

Launch the game

Sign into the preferred Xbox network account and allow the app to access your info

There is an initial screen upon pressing start in mcc displaying the words "let's get you signed in" upon pressing "sign in" I am promptly taken to "approve sign in request" screen with no option to back out and no way to approve the request with the authenticator app

I can't sign into my account on MCC on PC. I called xbox support for help and on their end, it says I have an enforcement action.

what is the error you get when you try to sign in on MCC?

do you have another account you can try to see if it is your account or MCC on PC?