Thanks @AndrewGifft!
I can confirm that the APN is set and the device has been connected to the network since I am able to send data intermittently.
The AT+COPS=? command appears to not be supported by Digi since I don’t see it on this list and using the command returns an error.
Hologram support suggested these steps, but none of these commands appear to be supported with the Digi modem.
Edit: The commands are available when AP is set to Bypass Mode [5].