Store-published Word add-in can't read or write the open document

Hi, I’d compare the Store-published manifest with the sideloaded or development manifest first. For Word add-ins that need document access, the manifest permissions and requirement sets matter a lot. Make sure the add-in declares the correct document read/write permission and that the API calls you use are supported by the Word client and platform where the issue happens. I’d also test whether the document is in Protected View, read-only mode, sensitivity-label restricted, or opened from a location that limits editing. If it works sideloaded but not from the Store, the packaged manifest or validation path is where I’d look first.