Just to follow-up on this. This was an issue with AT&T’s prepaid system when using non-AT&T devices. Basically non-AT&T hotspots were blocked by AT&T. This would have likely worked with a postpaid account with AT&T from the start. As of today though the issue is fixed and I’m getting internet on my X750V2 using an AT&T prepaid hotspot plan ($50 for 100GB).
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