If you are still using an older model MacBook Pro, here are some causes and solutions to the MacBook Pro Touch Bar not working issue.
Apple announces refreshed 14-inch, 16-inch MacBook Pros and iMac
Touchbar display partially off, come and go, something I could
Apple Class Action Lawsuit Alleges MacBook Pro Display Issue - Top
Apple MacBook Pro 14-inch M2 Max review
Apple MacBook Pro M2 13-inch review
How to fix it if MacBook Pro Touch Bar is not working
How to Manually Refresh Touch Bar on MacBook Pro
Software Update for 2018 MacBook Pro CPU Throttling Issue Released
Apple 16-inch M3 Max MacBook Pro review: A desktop among laptops