To allow mobile devices to access MARS, we added "GlobalEndPoints" in the web Settings: Null, "ms: / / businesscentral, ms: / / dynamicsnav", but the error 403 page displays the page could not be found.
I have not come across this issue in mobile. But based on sources can suggest
Fix the GlobalEndpoints value (no spaces, exact names).
Make sure the Web Server is reachable over HTTPS from the mobile device
Clear Mobile app and device cache; reinstall if needed.
Check Authentication and URLs
Check logs for the actual 403 reason -IIS logs
HTTPS / certificate not trusted by mobile device.
firewall blocking
wrong instance ( Wrong Nodes)
Regards
Pallavi Phade
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