IPv6 on Telstra network with EP06-E and OpenWRT

I am trying to get an IPv6 connection on the Telstra network in Australia using an EP06-E modem in a router running a version of OpenWRT.

I have only been successful with IPv4 connections.
I believe I should use an APN of either: telstra.internet or telstra.wap
I’m unsure what prefix delegation Telstra would be using - /64 ? /56 ?

Surely there is something simple I have missed…any help appreciated!

Thanks for your query in Quectel forums.
Do you have the AT command document of EP06? You can configure your APN information according to the AT+CGDCONT command, thank you.

Quectel_EP06&EG06&EM06_AT_Commands_Manual_V1.0.pdf (1.1 MB)