Lost backup- cannot sign in to MacBook

4578zwq wrote:

I have been doing all updates & was using a new wireless keyboard- all going well.

then I lost the ability to do a backup—& suddenly could not access my Mac computer. & new keyboard stopped working. The latest update shows but I cannot sign in.

MacBook Pro 13″, macOS 10.15

Use the built in keyboard and compare your results.

ref: Connect an Apple wireless accessory with Mac

Back up your Mac Back up your Mac with Time Machine - Apple Support

if no insight or resolve —

Call Customer Support  (800) MY–APPLE (800–692–7753)

or on line  Apple Support

Outside the USA—Contact Apple for support and service by phone

See a list of Apple phone numbers around the world.

Contact Apple for support and service - Apple Support

4578zwq wrote:

Lost backup. Cannot access Macbook

?

and how are these related....? Maybe you can paint a bigger picture of what is the exact issue