I would try a few things;
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Hardwire the hub directly your isp router with an Ethernet cable
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try to click this link;
http://hubitat.local:8081 -
restart the hub by unplugging at the wallsocket, wait ten seconds and then plug it back in and try the link above again.
If that doesn’t work you have one more option and that is to reset the network settings by using a toothpick in the irregular shaped hole at the bottom.