In the Teams channel where the meeting took place, find the recording that says it will expire:
Click on the link to change the expiration date:
This will open the recording on the cloud in an internet browser window.
Click on the small “i” with a circle around it in the top right of the window:
In the menu that opens on the right, find the expiration date box and click on the date:
Choose the desired expiration date:
That’s it! You’re done!