@Barb Clark , thank you for your question. It would appear that this might be more of an issue with Microsoft Teams.
You tagged Azure Communication Services(ACS) but didn't mention anything about using ACS being used within your setup. Can you please verify if you are using ACS?
If you are using just Microsoft Teams, they have their own forum to handle questions. We would suggest you post your question over there so Teams experts can assist you further.
Please do let us know if ACS is being used though so we can ensure ACS isn't causing any issues.
We look forward to your verification.