Additional meeting and call-related features and issues within Microsoft Teams for business
We had a similar problem in our organization. When sharing the PowerPoint project in Teams using the PowerPoint Live feature, the slides showed up on desktop machines but not on mobile devices. We finally found out that the issue was from having an apostrophe (') in the filename. We took the apostrophe out of the filename, re-shared the PowerPoint project and the slides showed up on all devices. If anyone has a similar issue, try looking for special characters in the file name.