By isolating variables I realized I was also specifying a wrong remote path. When I just made one mistake I got an error message that pointed me to the passphrase error.
I somehow got two entries in Lastpass for Duplicati passphrase. I don’t remember which to use. I’m having OAuth problems so it’s not possible to just see which one works. They both fail. Is there a way to check if I have the right passphrase w/o involving OAuth cert business?