UPDATE to post regarding Oura Support.

Mea culpa.

After digging into it at home, I discovered that I somehow swapped the original damaged ring with the replacement. (I suspect my kid, but no evidence...) Anyways, I ended up giving support the serial number of the original defective unit, not the replacement that’s actually in use.

So Oura's response was on-point - there should be no warranty for the *same* ring twice. My mistake was not throwing the old one out... Posting this to close the loop and own it.

Sorry!