That would indicate you are using your own accounts OAuth token, as regardless of what NICK you use when connecting, if you’re using the OAuth token from novaevermoon going through the OAuth flow, then it’ll be connected as novaevermoon. You can confirm this by using your OAuth token with the Validate Tokens endpoint https://dev.twitch.tv/docs/authentication/validate-tokens/ and it’ll return which use account is associated with that token.
If you want to send messages as thecelestialwarden, you need to log in to go through the OAuth flow while logged in to that account, so that account can grant the permissions needed to connect to chat and send messages as it.