Incorrect chainID type

[Mattijah]

Payload:chainId is type of number the front end: solana.signIn however expects an object containing chainId of type string more in particular "mainnet" else it throws an error and so signing is not possible. This obviously affects verification.

Furthermore, even though chainId is specified as optional, it gets included in the message with a default value anyway🤦🏼‍♂️

[DenysRakhuba]

Any updates on that? Because we are facing the same issue. Generating message through new SIWS requires chainId as a number, while phantom signIn method expects it to be string...