Originally Posted by
danger
I used a TSU and received a regular regency suite. At check-in, I said I would need the 4pm check-out and was asked if it would be possible if I was moved to another room around midday on the day of departure due to the limited availability of suites.
That is a completely unreasonable request and I would have refused. Your upgrade is essentially paid and you are entitled to 4pm checkout.
It would be different if it was a complementary upgrade, since those are subject to availability (and may not be available after noon).