The app was not correctly configured and cannot access your Dropbox

Just found this thread after suddenly encountering the same problem - suddenly 1Password app on the Samsung Note 20 Ultra 5G stopped syncing via Dropbox. It's already very frustrating, but it's even worse for me...

I completely reinstalled everything - Dropbox and then the 1Password app. Now, when I launch the 1Password app, a welcome screen appears asking me to register and asking, "Already using 1Password?" and four options - 1Password.com, Dropbox, WLAN Server and Local storage.

So, when I choose Dropbox, I see a screen with a single field asking me to enter my master password, but only for a split second. Then I get the message: "Error: The app was not configured correctly and cannot access your Dropbox. OK."

Even when I manage to return to the previous screen and enter my master password (actually, it can be anything - I tried), the app says: "There was an error locating your vault in Dropbox (UNKOWN_VALUE). Please, try again."

Next thing is that if I use syncing via WLAN server, which works, then I have no option to change how I sync afterwards. There is simply no more choice...

Any advice on how I can fix this would be greatly appreciated. Thank you.