Got a reply from Esri. They say that they do not allow mock location apps. Which to me sounds completely unreasonable. QC and S123, both Esri apps allow it and work perfectly fine. Collector allowed it and work fine. Just Field Maps does not work.
I think this info is not correct because Trimble, Leica...etc need mock location access while working with FM. If FM does not allow mock location apps then why they ask for mock location access! Esri closed the case and that's it for now.
Esri needs to change it. Or explain why they block mock location apps and how or why Trimble...etc get access and open NMEA devices not.
Sincerely
