I can't login to iMessage after updating mac os to Big Sur on my iMac 5K 2019
After I have updated my iMac I can't log in to iMessage, when I type my Apple ID credentials I get spinning loader and nothing happens, sometimes I get an error message: "An unknown error occurred
". This is happening only on this device.
P.S. - I was already logged in to iMessage before updating to Mac OS Big Sur, after updating it logged me out. My Apple ID region is Serbia.
iMac 27″, macOS 11.1