Hello Joe Dobson,
Good morning!
I hope this email finds you well.
We sincerely apologize for the inconvenience you are experiencing with the Microsoft Teams status issue.
Based on your description Microsoft teams status stuck on 'Available, Out of Office' and you are availed unable to reset. This is automatic replies status and you can't reset , if you don't need you need to turn it off.
There is three ways to turn it off the teams status:
1- Please go to your teams , near from your profile click on three dots << setting << General << under Out of office click on schedule and turn off the automatic replies and save and check the issue
2- If there is nothing setting over there, kindly go to your outlook desktop the classic one with the same affected account and check if there is automatic replies turn on if yes turn it off. Kindly go to your classic outlook File << Automatic Replies (out of Office ) and click turn off and check your status

3- If the issue still persist and you didn't find anything in your classic outlook , you need to turn off the automatic replies via your admin center for the affected account. You need to contact your admin or IT department request to turnoff the automatic replies for the affected account in the admin center. Reference: How to set automatic replies on a user's mailbox in Microsoft 365 - Exchange | Microsoft Learn
We look forward to your reply. We will continue to assist you based on the information you provide. I sincerely appreciate your patience and cooperation.SincerelyEben Ezer Tres | Microsoft Community Moderator