AT&t SIM issues with 5G

I’ve been discussing which SIM to get here: Want Verizon and ATT SIMs in West Coast USA - #9 by soylentgreen

I just purchased an ATT 5G SIM on their Prepaid $35/15GB plan, put it in the Pepwave MAX BR1 Mini (firmware 8.1.2) and… it just got stuck on “Obtaining IP address.” All SIM settings were defaulted to “Auto”.

On a lark, I forced Cellular Settings to Custom and set the APN to nxtgenphone and suddenly it works!

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So I’m guessing there is some problem with the 5G ATT SIMs where the Peplink can’t figure out the proper APN?

Question: Is nxtgenphone the proper APN to use?