400 "invalid client" response in Oauth Credentials Flow

[BarryCarlyon]

@misha_shivers

I’m trying to set up a chat reader app, but I can’t get past the first step of authentication. I haven’t found this error discussed in the forums. I’m following the “Client Credentials Flow” for OAuth, which specifies the following request format:

For a start, thats the wrong kind of Token, you have to use a user token to login to chat.

@misha_shivers

I’ve seen other error messages discussed on the forum: “ invalid client secret ,” “ missing client id ”, etc. But I haven’t seen a discussion for just, “ invalid client .” Is this a problem with how I’ve set things up, or is my new application missing some sort of permissions?

Invalid Client usually means the clientID is not valid. You may have copied and pasted it wrong.

Either that, or it’s becuase you are trying to get chat:read on something that can’t use chat:read. To login to chat you need a user token. Not a server to server token.