iMessage and FaceTime not working on my Mac mini

my iMessage and facetime keep signing me out. this issue started as me receiving messages and now being able to send, i decided to leave the apps for a while only to find me signed out. with every attempt to sign back in, i get signed out

i have tried restarting my mac, changing persons for my iCloud account, signing out and in of my iCloud account and i still can't seem to get around the issue

[Re-Titled by Moderator]

Original Title: imessage and facetime not working