Sonny Software

Hello,

Frequently (once a day or more), Bookends asks me to sign in with my AppleID. This began after I changed by AppleID.

I've followed the FAQ (https://www.sonnysoftware.com/faq/faq.h ... sked_to_re). Clicking Cancel, rather than entering my password, as instructed brings me to a sign-in sheet that allows me to check "Stay signed in". When I enter my password, I get a message that the ID has to be verified and I receive a notice from my mac about allowing a new sign in. I grant access and am given a code, which I enter. Then Bookends presents an error message:
"You can only add the @mac.com address that is already on file in your account." The address I used is the same as always.

When I'm initially asked to sign in, I can use TouchID and it logs me in just fine and I can sync. Its just that it asks me to do this at least once a day.

Please also try Troubleshooting tip 2 to Sign in via Safari:
https://www.sonnysoftware.com/bookendsontap/cloudsync/

Just tried that. I signed out of iCloud from the cloud icon, then holding the option key clicked sign in from the cloud icon. A page in Safari opened and asked for my info (same as the drop-down sheet in Bookends). I entered my username and password, entered the access code and the same error message pops up that shows my email address in a box with the text " You can only add the @mac.com address that is already on file in your account." underneath it.

Here is a discussion on Apple forum: https://discussions.apple.com/thread/8415217