91000: Cannot enter presence without a clientId

A request to enter the presence set was rejected because the connection had no clientId. Presence members are identified by their clientId, so one is required to enter.

What you should do

Give the client a client ID before it enters presence. Set one when the client authenticates, either in the client options or in the token issued to it, or enter on behalf of a specific client ID with enterClient().

Why it happens

The client tried to enter the presence set without a client ID. A connection has no client ID when it authenticates with Basic authentication, or with a token whose client ID is a wildcard, and none was set in the client options.

What you'll see

The error is reported with code 91000 and HTTP status 400. The message is of the form unable to enter presence channel (no clientId).