When I entered the wrong remote path (Google Drive) I got an error message that was helpful.
When I entered the wrong passphrase I got an error message that was helpful.
When I did both the error message was not helpful.
Duplicati just worked for me for a couple of years, so I didn’t think about all the setup details, until I got a new computer. I somehow got two passphrases into Lastpass, only one was right. I forgot I changed the destination folder on Google Drive to myConfigurationName3. And so it goes.
I would have had a shorter time of it if I had been told “Your passphrase didn’t work” and “Your backup path ain’t there.”