# 91001: Cannot enter presence in the channel's current state

Identifier: `cannot_enter_presence_in_the_channels_current_state`



A request to enter the presence set was rejected because the channel was not in a state that permits presence operations, such as a channel that is detached, suspended, or failed.

## What you should do

Enter presence once the channel is attached. If the channel is detached, reattach it; if it is suspended, wait for the connection to be restored, after which the SDK reattaches automatically; if it has failed, resolve the cause shown in its [error reason](https://ably.com/docs/channels/states.md) before reattaching.

## Why it happens

Presence can only be entered on an attached channel, and the channel was detached, suspended, or failed at the time.

## What you'll see

The error is reported with code 91001 and HTTP status 400. The message is of the form `unable to enter presence channel (invalid channel state: <state>)`.