The current website is trying to send a request to the Hive Keychain browser extension for account Hive account@samsmith1971 using the active key, which has not been added to the wallet.

By "wallet", it means your Hive Keychain Extension. This wallet lives on your computer. This is not to be confused with on the web. So when you loaded your account into the Hive Keychain you used your posting key. Remove your account from Hive Keychain and add it back in again but this time with your master password. The keychain will figure out your active key, and posting key from the password.