wallet – What can I do if a website indicates that my BC1 address is invalid?

The address you use starts with bc1 and is a bech32 address. Many online wallets still do not support this form of address. For this reason, the invalid bitcoin address error is displayed. If you want to use segwit and are still compatible with these online wallets that do not support bech32, you can use P2SH addresses (P2WPKH) starting with 3.