Hi,
How did you add the add-in in PowerPoint?
Did you mean the third part add-in for PowerPoint or Add-in program in ribbon?
What version of Office did you use? I suggest you go to File- Account and provide the detail version number here:
Please refer to this support article and check if it helps:
Please be a bit more precise to explain your problem or you can upload a screenshot so that I can get more accurate solutions to this problem. I’m glad to help and follow up your reply.
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