This answer, and others here, were entirely valid for my issue. Replaced Wi-Fi router following power-outage/surge; diff make/model, but re-used previous config info. Genie might not have "known-about" my new router, but it *did* see (but not validate) its conn. I followed all of your great leads (including firewall), but ultimate solution in *my* case was to increase the number of allowable DHCP connections...not only a new router, but several more DHCP connections since, maxing out. Thank You (All) for your input(s)!!!
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