Need help understanding Different Auth type, [reply tweet].[Filter tweet]

[khanakhun]

Hi, I'm creating a bot that gets tweets with specific mentions in it by using the filter v2.searchStream method and replies to them, the problem I'm facing is with authentication.
1: if I use the Bearer token then I can get incoming tweet streams but I can't reply using this auth.
2: If I use apiKey, apiSecret, access_token,access_token_sercret, then I can reply to a tweet but get auth error while using filter API to get tweet stream

Note: my dev account is going to be one to reply
or is it safe to use two clients with different Auths ?