Sorry you’re having such issues.
If you can get on the website and see your travel summary, it will show just above your itinerary the boarding time starts…..
Usually says 1230pm but, if from the US, they usually start boarding about 1100 to 1130.
So go at a time convenient for you. We go early about 930 or 10 and board by 11 or so.
If you have a roll call for your cruise, reach out to them to see what the travel summary says, if you can’t get it up.
Good luck to you!