I seem to be having the same issue, even after deleting and re-linking. It initially says it was successfully linked then says this 
nostr:npub1m64hnkh6rs47fd9x6wk2zdtmdj4qkazt734d22d94ery9zzhne5qw9uaks you can try going to settings > account > nostr > delete keys and try linking again. If not can you send me a DM with your Fountain userID and I'll take a look.
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