Conversations involving multiple participants, allowing collaboration and information sharing in Teams
It's really odd behavior, I suspect it could be an intermittent issue.
In the meantime, you can use MS Teams online to make a call.
Please follow these steps below:
- Please go to your computer then open your chrome or edge browser as the only recommended browsers to access MS Teams online.
- Please go to MS Teams online https://teams.microsoft.com
- Then try to log in & make a call.
I do believe this issue needs to be investigated furthermore by the MS Team engineering team so they can determine the best next steps for this particular issue.
I highly suggest you report this issue, If this is a bug normally they will release fixes but as a community advisor, I can't guarantee that for you since I don't work for Microsoft.
Follow these steps: Select Help > select report a problem
Kind Regards