Can't sync on Android from encrypted Dropbox

I installed the desktop version on both a windows and Mac, and I was able to sync with Dropbox with encryption enabled. Then I installed Joplin on my Android 12 phone and tried to follow the guide to sync - I enabled dropbox sync and then clicked Synchronise, but it comes up with an error

Created remote items: 1. Completed: 2022-06-17 16:14 (3s)
Last error: Error: Could not encrypt item [HASH]: Master key is not loaded: [HASH]

i also tried to wipe data/reinstall and enable encryption manually with the same master password as on the desktop, but I got the same error.

How can I get the notes that are already sync'ed on Dropbox to my Android?

Anyone?

Shouting for help one last time ... anyone?