gmail not sync'd between iphone and macbook pro
Hello everyone. Several days ago, my MBP and iphone have stopped treating gmail the same. Previously, when I deleted or read an email on either device, the email would be deleted or marked as read on the other. Now, my iphone appears to be functioning properly, but the MBP isn't... If I delete or read on MBP, the iphone updates accordingly. The MBP will not acknowledge what happens on the iphone. So, now I have hundreds of emails which are unread (and possibly undeleted) on the MBP.
I have not made any changes to either device (updates, apps installed, etc). The only potential difference is that I was out of town with the iphone and left MBP home for several days, but I cannot remember if this occurred before I left.
I have quit the apps and restarted both devices and the problem persists.
Any thoughts?
MacBook Pro 15″, macOS 10.13