Hey there, sorry for the late reply. Did you get it resolved? Did you check the transaction on etherscan? I think there are 2 transactions for staking BPT on yfv.finance. The first is to allow the contract to spend your BPT and the second one is to stake it.
Please join the telegram chat: https://t.me/FinanceYFV
Or discord: https://discord.gg/Dpvd7tp
They can help you out much faster!