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block port 123 udp on your Router
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reset the hub and onboard the hub to the app
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unblock port 123 udp
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if you don’t have the ability to block port 123 udp than block the domain ntp.org and follow the same steps above. Many Routers have a parental control option that allows you to block domains.
you can find full details on the issue in the following thread: https://community.smartthings.com/t/troubleshooting-smartthings-hub-2018-and-aeotec-hub/298332