Error code: 91000 - Unable to enter presence channel (no clientId)

Receiving this error means that you attempted to enter the presence set of a channel without specifying a clientId.

There are a number of ways a client can be identified (have a clientId associated with it:
- One way is if using token authentication with a token that's associated with a clientId (that is, the clientId field in the tokenParams was populated when creating a token request or requesting a token).
- Another way, if using basic auth or token auth with a wildcard clientId, is to pass a clientId in the client options when initializing an Ably SDK.
- Alternatively, you can leave the client unidentified, but specify a clientId at the time you enter presence, using enterClient().

If your server is handling multiple clientIds at once then it's worth checking out our advice on dealing with this.

If you want to see further details about information needed when entering presence then please take a read of the following docs.

Please get in touch if you need any further help. We'll happily do what we can to get you up and running in no time.