I can attest that YES you can have it changed from a TA to RCCL, because we just did it (back in April). Our TA ended up being the worst and she was "engaged" to our DIL's dad (but not anymore thank goodness!) We had booked for a B2B around Australia and NZ 2021, which of course got cancelled. Moved it to 2022 and of course the same thing. I would call her to have something either added or maybe changed our cabin to a better one and all she did was complain on how horrible it was to call them!! Sorry but you don't tell a customer who is Diamond + how horrible they are!! Plus I knew more then she did!! Anyways, the final straw was when she was on a cruise and there was a price drop. I sent her a FB message with it. She read it right away but never replied (BTW, she did have an assistant who was back in the states at this time!) but replied to a comment someone else posted. Next thing you know I'm getting this message on how she is at sea and unable to call. Ok, understand, but you do have an assistant. Also replied that RCCL does these sales on a rotation and it will be back around, no, not if there are only 2 cabins left in your catagory and once they are gone, no more sales for you!! I finally had enough of her complaints and talked to RCCL. I did have to email them everything as to why I wanted to switch our reservations, which I did include her texts on everything. Within a week, I got my confirmation that they now would handle it. This all took place in April, I was still having issues when I would sign on to my RCCL account I could not see my balance. I would call and nobody could figure out why, everything looked good on their end and yes the reservation had been switched!! About a month ago, I decided to look at my TA account and it still showed it was there!!! I texted her the next morning, just asking why would my account still show the 2 cruises??? OH she went off on me saying she was waiting for me to tell her that they had been transferred before she changed the status in her system!!! Then she went on saying how she knew I was deeply concerned over a $60 or $80 potential rebook savings while she was in the middle of the caribbean, but at the time RCCL's hold time was more then 4 hours and it would have been very expensive to call and taken those many hours out of her day!! Then went on to say did I know how many hours she invested in our cruises?? Booking, rebooking, FCC's, etc!! Way too many and she had yet to receive a dime!! It got quite nasty after that!! All I said was if I remembered correctly she had hired an assistant and all it would have taken was a message to her, very simple!! And also she was back in PR on sunday . Her response that these sale are on a rotation was not very professional, and I'm sorry that it might have ONLY been $60 or $80 (it was actually $100) but that was money back in MY pocket. If she didn't like putting in the hours and not getting paid till after we took the cruise, then I guess she is in the wrong profession, I have nothing to do with that or that there was a pandemic and I had to cancel 2 very expensive vacations. This is exactly why I do my own flights and the rest of our vacation!!! So glad we got rid of her and so is our DIL who is happy her dad kicked her out!!
Oh forgot to add, in March when they pulled the Radiance out to move it to Texas I think, I sent her a message that it had been changed and she told me no it hadn't!! I replied, well our friends who were going with us who are from Sydney, had already received their email from RCCL informing them!! She really wanted to argue with me about it!!!