TL;DR:
Microsoft are making some changes to the wiki experience in Teams channels. At present whenever a new private or standard channel is created then a wiki is automatically provisioned for the channel and added as a tab in channels…no longer. Due August 2022.

Details:
Teams will not provision a wiki by default when a new private or standard channel is created. You can add new wikis as tabs in channels from the channel store as and when needed, there is no impact on existing wikis that are already available.

If there is automation that runs on the wiki when a new channel is created, it may need to be revised to address this change.

Availability:
Due Mid-August 2022

Page originally published:
15th July 2022 and kept up to date.

MC399867