We're developing an MS Teams Meetings Tab app. The Tab UI is served through NginX. Currently the app package is installed using the 'Upload custom app for the org' button.
All users use the Teams desktop client exclusively. Most are able to add the app to their meetings and use it without issues.
However, some MacBook users are unable to add the app to any meeting. On clicking the '+' button on their meeting details page, they can find and choose the app. But the app configuration window stays blank (the config page never loads) and the 'Save' button remains disabled. No NginX access logs are printed in this case.
These users are on the latest Teams version (at the time). They can add other apps (like Polly) without a problem. They're also able to add our app through the same user account from other MacBooks from the same network.
Is this a bug, a known issue, or are we missing any configuration steps?