We've been busy testing the new geoPDF functionality in Field Maps and think we've either found a limitation or a bug. Would be good to see if others have too. We've tested on android mobile devices where some are factory standard but others have organisational Mobile Device Management software in place. If a geoPDF is downloaded from the Web via a browser, they always work when opened in Field Maps. However, if a geoPDF is saved to the device from Outlook or Teams, they only open if the device doesn't have MDM. The attached screenshots show a warning about encryption being added when saving the pdf to device on the MDM devices and they then fail to load in Field Maps.
The encryption does not prevent the document from opening in any other apps capable of viewing PDFs.
Please note, that our intended work flow does not rely on publishing the document through ArcGIS Online. It's intended for viewing docs received from other sources.