@brichert
Your machine does have Wireless LAN 802.11 b/g/n featuring Single-band (2.4 Ghz) 1x1. Its specs
https://support.hp.com/au-en/document/c03517210
Please ask AT&T staff to allow modem/router to broadcast both bands (dual band) which are 2.4GHz and 5.0 GHz otherwise your machine can't connect (can't see SSID of your network).
Regards.
BH***
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