Cash app to binance(bitcoin)

I'm new to all crypto stuff, but I lately sent over some bitcoin from cash app to somebody’s binance account. The withdrawal has been confirmed on the block chain for like 20 hours however the recipient nonetheless says they haven’t acquired it. It’s some on-line stuff so it could possibly be scam but dude appears fairly legit. Is there any additional confirmations the recipient needs to do on their aspect or does it just take a while for funds to undergo.

Also he reused a crypto tackle he had one other customer use prior. I don’t know if that messes with it.

Anyone know something which may assist?