Upgraded Macbook Pro to Sequoia 15 now touch id no longer works. Help!

How many times has the computer been restarted since the macOS 15.0 Sequoia upgrade was installed ?

Restart in Safe Mode.

This will perform a Disk Repair, clear cache files and only load Apple Software, extensions and fonts.

The boot up will be slow and can take some time - Normal.

Safe Mode will also eliminate Third Party Software, extensions and drivers from loading.

It will only load the Minimum amount of Core Apple Processes to allow the the computer to function at a reduced Level of Performance 

Does the issue present in this mode ?

Sometimes a Safe Boot followed by a Normal Boot will just put things right.

Use Touch ID on Mac

If all above does not resolve this issue

Have the computer evaluated by the Professionals who have the Special Hardware Software and Expertise to diagnose the issue and offer possible solutions

Make an Appointment at the Apple Genius Bar or call 1 800 MyApple and have them evaluate the computer

Other location Call Centres 

 Contact Apple for support and service

Thank you both for commenting on and providing a solution this issue... I was totally freaked out about Touch ID not working. The third restart is the trick.

Now happy (too)!

You are Welcome

Do come back to the Apple Support Communities ( ASC )  in the future if additional questions may arise.