My mobile is not unlocking the face id

If an alert says Face ID has been disabled on your iPhone or iPad Pro - Apple Support

Thanks. Interestingly that referenced article didn't appear when I first opened the post and why I provided it to the OP. Maybe, it was a delay? Then again, it could just be me doing one of the "Doh!" moments. ;)

Time to go to the last step in the article you came here from and contact Apple Support.

That is the exact article they came from as noted under Related Articles above.

I've never experience a delay if they click on the go to ASC from an article, even from some that were less than a minute. But given this site I'm sure it is possible. Or you are low on coffee.