VPN error connecting

|Device Model|MP70|
|Radio Module Type|EM7511|
|Radio Module Identifier|ATT|
|Radio Firmware Version|SWI9X50C_01.14.02.00 2e210b jenkins 2020/08/19 14:18:39|
|Radio Hardware Version|1.0|
Boot Version 4.0.4

The VPN status says “Error Connecting”, The SIM card is activated and device is configured properly, but I can’t get the VPN to work. What settings can I check? The settings on the ACM servers match the settings on the airlink router.