Processes in Microsoft 365 for setting up Office apps, redeeming product keys, and activating licenses.
On https://apps.apple.com/us/app/microsoft-powerpoint/id586449534 if you scroll down to Information/Compatibility you will see that 16.0 is minimum. Sorry. I checked Microsoft 365 app too, it's 16.0. https://apps.apple.com/us/app/microsoft-365-office/id541164041