I am having this problem on my new linux system. I am installing enpass version 6.9.0.1467 from flatpak. I have enpass installed on mutiple windows, android, and linux systems but having issues with new system. I have tried the following all with no sucess.
1. just trying to connect to an existing vault (fails for vautls on dropbox and onedrive)
2. restoring from a backup then trying to connect (fails for vaults on both dropbox and onedrive)
3.I tried the suggestion above and and deleted enpass and ~/Documents/Enpass and reinstalled same issue
4. I even tried to resolve by completly reloading the system from ISO same issue.
A month or so ago I was experimenting with another linux distor and had similar issue with connecting to dropbox/onedrive but I was able to restore from a backup and then connect but that didn't work this time.
Any help woud be greatly appriciated as I need to get my new laptop set up and usable.