no, it's about 0.0021 BTC. Now the transaction status is showing Confirmed 6 confirmations, still, the problem is showing. I don't understand what to do
Why not import the seed phrase on Electrum and see if you will be able to spend the coin.
Electrum official website:
https://electrum.orgWhile importing the seed phrase on Electrum, make sure you click on BIP39 and check it ✅
Is switching to a better wallet an option?
Probably he can import the seed phrase on Electrum and see if the error would still occur or not, a nice idea.