I just had a better read: "Unable to send coins, unable to broadcast sweep transaction: transaction rejected: output already spent." It feels familiar, I had the similar situation when I was closing my Umbrel node a few years ago, but I don't remember exactly what I did.

After trying the chantools another option is to try to increase the gap limit (the wallet where you received the funds). Is it possible that the sats are already in your on-chain wallet but you just can't see it? #409125