Problem
The only channel manager of a channel was removed from the organization.
Solution
If there were other members in the channel, the member with the longest channel-membership will automatically be promoted to the channel manager. This does not apply to @Channels.
You can check in the channel member overview who is the new channel manager. The new manager can promote other members to channel manager to transfer the channel's administration.
If the removed user was the last member of the channel, the channel will be automatically deleted.