No issues checking in with RCCL.
The certificates were checked to ensure they were in our name, the test was taken within 48 hours, negative results.
We used the BTNX kits issued in Ontario.
Presently in Amsterdam, just completed my test with Life Centers, Proctor was in Calgary. Used my IPad, phone would work just as well. Received test results in about 5 minutes.
Thumps up to this company, going on a cruise now.