Additional sign-in or account-related issues within Microsoft Teams for business
Hi Suzanne,
I am an independent advisor and a Mac user like you, and I would be happy to help you out with this.
I would recommend to try uninstalling the Teams app, and then re-installing it.
First, Quit Teams by right-clicking the Teams app in the dock, then holding down Option and clicking Force Quit. Open the Application Folder, select Microsoft Teams, and move it to the Trash.
Source: https://support.office.com/en-us/article/uninst...
Second, re-download the Teams app here:
https://www.microsoft.com/en-us/microsoft-365/m...
Then, follow the installer instructions and this will install the latest version.
Hopefully now when you log in, it will get past the "Loading Microsoft Teams" box and load the full application for you.
I hope this has helped you. If the problem continues, please reply and let us know and we would be happy to look into providing some different suggestions!
Regards,
-Ashton