Microsoft Word Add-In Default Icon in Ribbon

Question

I'm trying to get a Word add-in published into the Microsoft App Store and continue to get rejected for '1100.5.6.2 Default Icon in Ribbon' 'The Ribbon icon for the offer is displaying a default icon in Microsoft 365 on Windows, Word (16.0.13426.20330) 64-bit.'. I've included a IconUrl with a DefaultValue in the manifest file, along with every sized Icons defined under OfficeTab, but it's still not loading the icon when being reviewed. Any help is appreciated.

Chutzpah

Have you followed this procedure? learn.microsoft.com/en-us/office/dev/add-ins/reference/manifest/… – Snuff

Did you ever figure this out? I just got back the same response but just realised one of my urls was returning a 404... – Amieeamiel