Just to follow-up on this for anyone else enquiring - unfortunately due to a flight delay of 72 hours, my layover turned into a 4 hour connection in Papeete so I just kept my phone on airport wifi for the time spent there. I wasn't wanting to spend (at least) $12 for only a few overnight hours on...
I called in this morning. After some checking and back and forth it was determined that Tahiti is included as part of EasyRoam's coverage in French Polynesia. It looks like there had been some updates recently to the countries included, so I imagine it got left on the 'No' list accidentally.
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