I'm not using Google Drive but using Next cloud.
I have taken a manual backup of the data, deleted the account, and restored it. I am not going to erase everything in Advanced as I have five vaults in Enpass which will cause massive headaches getting everything working again.
I did set up and new vault and synced it to Nextcloud. My version of Enpass was 6.8.1 and checking for updates did not show anything else that was newer. Going to your web site I found that 6.10.1 was out and it used a different apt source. I set up the new apt source and it updated to 6.10.1.
However, the problem vault that was not syncing, was gone. Restored the old Enpass, it showed the problem vault, I renamed the Enpass folder on Nextcloud, did a sync and told it to Restore, then verified the data came over the Android Enpass. Then did a backup on the Android side. Upgraded Enpass again, added the vault from Nextcloud and now it is working. No more errors.
So everything is working again. Thank you.
BTW, why did the new version phone home and request a six digit code for registration? Once it's unlocked, it should stay unlocked. What if the Enpass company is wiped out, that means I won't be able to access my vaults. Not good!