What to do when a website says that my bc1... address is invalid? I used local Bitcoins wallet to send bitcoin to my bitcoin wallet. But it said wrong address
The address that you are using starts with bc1 and is a bech32 address. Many online wallets still do not support this form of address, which is the reason you are getting the invalid Bitcoin address error. If you want to use segwit and still be compatible with these online wallets that do not support bech32, you can use a P2SH(P2WPKH) addresses that begin with 3.