I don't really want to get into a big discussion, but if the network is online and the C8 has an IP, it should be honorig the DNS server option, and that DNS server was available and functioning as expected. Further it was enabling the Alexa skill that wasn't completing, and this has happend to me now exactly twice at almost a year to the day...
This typically happens only when the hub doesn't have access to the Hubitat cloud. In 5+ years, I haven't seen other situations causing this. And lack of cloud access typically happens when there are issues, temporary or permanent, with the hub accessing a functional DNS. A search of this community would provide an indication of how frequently the latter happens.
This can be revisited if/when your hub indicates a lack of cloud connectivity.
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