I’ve seen the problem reported but no solutions. Using UCP users are unable to edit their phones with Device Management. Make any changes to Line Keys or Exp 1 and when saving, the browser reports you are working in Offline Mode. However, if I make the changes using EPM through Extension Mapping -> Edit the Custom Entries, then the changes work when saving the configuration.
The EPM appears to be at the latest version and the phones are Sangoma S700 with the EXP1.
Current Asterisk Version: 13.17.1
EndPoint Manager 18.104.22.168
Firmware on phones are S700 22.214.171.124 and S700 126.96.36.199 (no difference)
Does anyone have a possible solution to this?