sir_dave, you are right. 802.11ac is on 5 GHz only. LINK
I'll admit, I haven't looked at the info yet, but if 2.4 isn't actually ac then why wouldn't it just have connected as it did with my old router?
Maybe the SSID is different on the 2.4 GHz network. And if you didn't set it, ...
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sir_dave, you are right. 802.11ac is on 5 GHz only. LINK