A family of Microsoft presentation graphics products that offer tools for creating presentations and adding graphic effects like multimedia objects and special effects with text.
Hi Tiago,
I think you already done most of the troubleshooting steps and you may try to uninstall Office and reinstall it to check the results.
Step1: Uninstall Office from a PC
*Use the uninstall support tool to confirm Office have been completely uninstalled.
Step2: Reinstall Office 365 on your PC.
Besides, may I know the update channel and detailed version of Office you are using? I can do some tests on the specific PowerPoint client.
*In PowerPoint, click File -> Account, on the Product information panel, you can find the detailed version and update channel of PowerPoint on the About PowerPoint section.
Best Regards,
Hugo