I don't know the complete story, but i'm assuming he/she has a native segwit address (starting with bc).
He/She probably needs to change the derivation path to BIP84 (on iancoleman's site)...
Thank you and thank you for all the other replies. My friend thinks they can narrow down the passphrase a lot and so this may work, but I have suggested to them if they don't find it quickly they use Btcrecover.