Icloud says I am signed in already when signing in.
iCloud as I said above won't let my I Mac sing into iCloud. (can on iPhone, iPad and Apple TVs). It said to delete internet account which I did - still same thing. Signed out of App Store and iTunes. restarted computer. I have new iOS10.15 installed. now not only can't I sign into I cloud but can't resign back into iCloud for email on Mac - it says already signed in as...... . and they iCloud account already exists. I can sign into it through safari and see my files get mail and manage it. Went into as other user signed out of all iTunes apps and cloud. Anyhelp??? I see others have had problem but no fix. I noticed that when I click on tab to start using iCloud a get a temporary iCloud overview of my account about a second the it switches to sign in.
Something Else I tried is to log into other user on iMac and was able to sign into iCloud on that account, logged out went back to my user same thing (already singed into I cloud account)
Rob