This may imply some changes to the ephemeral message flow if it’s redundant to post anything in the channel you’re currently viewing.
1. Create an incident.
2. After the incident is created, it should navigate the user to the new channel.
If the same user has multiple sessions open, it would only change to the new incident channel in the session where the incident was started.
Have other users logged in and verify that no channel change occurs when another user starts an incident.
When a new incident is started, verify that an ephemeral message is shown indicating that a new incident started with a link to the channel.