Hey @bu11etpr00f,
I appreciate your efforts in sharing that Enpass is not syncing with DropBox. In order to resolve this issue, I would suggest you try the following steps:
Firstly, take a manual backup of your data on all the devices.
Secondly, disconnect the DropBox sync from all your devices.
Now, login to your DropBox account in a browser → Open the Enpass folder → Select vault.enpassdbsync file → Rename it as oldvault.enpassbdsync.
Try to reconnect the device that has the latest updated data with DropBox. If synced fine, sync the rest of the devices.
If sync starts to work fine, you can delete the renamed old backup file from step 3.