I have two iMacs, 17,1 w Mojave and 19,1 w Catalina. Catalina Mac can see the Mojave Mac via bluetooth. I am trying to sign out of iCloud on the Mojave iMac. I am using the same Apple account on both Macs. I use iCloud for my desktop on the Catalina iMac, and for the Mojave iMac. When trying to...