Additional features, settings, or issues not covered by specific Microsoft Teams categories
Hi Ashley Lee,
Thanks for reaching us in community!
For this issue, you can first let the user open a web broswer to check whether this issue happens on that team in Teams web app. As the owner, in the team, go to Manage team > Channels, recheck the "Show for me" and "Show for members". And try to create a new channel in that team to see if this problem persists for him/her.
Best,
Shawn