Jsaon, I don't think you need to do anything with the PR portal if you aren't leaving the airport. I'm not sure how connecting flights work because I do recall in the past you had to get your bags? But we did leave the airport and that was when they check the QR code we got from the portal.
As far as testing, going to the US, the Ellume home test is another that is accepted for entry. We ended up using that for the PR portal and it worked fine there too.
Agreed, you SHOULD not need the portal if you are in-transit. I always like to ask because some of the airlines at EIS have been requiring it to check in even though it's not required. Had several guests get surprised by this and have to navigate the portal on their phones while trying to check in at EIS.
My real question is whether anyone in PR asked to see the test results. I thought maybe immigration or customs might ask. Just want to be prepared.
