AADSTS50020: protected PDF issue for external users
I have been recently (don't know when it was started) observed getting error from protected PDF (sensitivity label with user defined permission) file while trying to open that pdf via AIP viewer mobile app (Android/iOS) AS external user (who has permission to open/view). No issue with Office file types protected. external (not internal, not guest) user (currently testing with gmail.com account, other O365 tenant user) getting error as attached from AIP view mobile app. We do have AIP excluded at conditional access policy which helped so far to avoid this problem for external users. Is there been any recent change in behavior around user defined protected PDF? Since user having problem is external, have no clue where to look for log and start investigation. Error code: AADSTS50020Sharing: PDF readers that support Purview labels
As I was researching on Adobe Acrobat reader and Sensitivity labels, I decided to check if the common alternative PDF readers out there are able to support Purview MIP Sensitivity labels. There is already a published documentation on this for SharePoint-Compatible PDF readers that supports Microsoft IRM: https://learn.microsoft.com/en-us/purview/sp-compatible-pdf-readers-for-irm (last updated Nov-2023) but I wanted to see if these same PDF readers supports the ability for end-users to use/ select labels similar to that of Adobe Acrobat As of 11-June-2025; atleast one of them clearly do: Nitro PDF: Yes. Documentation shows that users can see and use the sensitivity labels. PDF -X.change Editor: Yes. Documentation show that users can see and use the sensitivity labels. (check the official website, I can't hyperlink it because the site is blocked. FOX PDF editor: No. Documentation only states RMS and not clear if it show Purview labels. This is for F.O.X.I.T editor (spelled without the ".") but for some reason there is a community ban on that word and it won't allow me to post the full name PDFescape: No. Sumatra PDF: No Okular: No If there are other PDF readers that I've missed, I encourage you list it down in the comment below. Would love to grow this list.
