FAcetime not working after software update
I update my Imac to Big Sur 11.3.1 and not I cant log into facetime
iMac 21.5″, macOS 11.3
Hi cec26,
Apple Support have articles online that may help you.
If you can't sign in to your iMessage account or FaceTime:
https://support.apple.com/en-au/HT204408
To use iMessage or FaceTime, you need to activate them on your iPhone, iPad, or iPod touch.
If you see an error message during activation:
https://support.apple.com/en-us/HT201422
Hope this helps you ")