91003: Too many presence members

A request to enter the presence set was rejected because the channel already held the maximum number of presence members permitted. The limit counts the members present on a single channel.

What you should do

Reduce the number of members present on the channel, for example by spreading them across more channels, since members that leave or whose connections close free capacity. This per-channel limit is the same on every package, so if your use case genuinely needs more members on one channel, contact Ably support.

Why it happens

The channel already held the maximum number of presence members its limit permits, so another member could not enter. The limit counts the members present on a single channel, not across the account.

What you'll see

The error is reported with code 91003 and HTTP status 400. The message is of the form Unable to enter member to presence channel; maximum number of <n> members exceeded.