Guaranteed rooms not available? Why?

[doulasue]

I booked my 5/12 wonder cruise in early Feb with my travel agent at AAA. At the time I requested category 11, guaranteed (we had good luck on another line with guarantee, and got really upgraded!). I was told that guarantee cabins were not available.
Maybe I am dense, but can anyone tell me why? Were they just sold out? I am hoping for any type of an upgrade, but it seems like there would be zero chance of that happening without a guaranteed cabin. I couldn't get a straight answer as to why they were not available, and am wondering if anyone can help me. Thank you! Sue

[Wendy]

The guaranteed staterooms are only available when most of the that category is fully booked and they do not have a stateroom assignment available. When that happens, you can get a guarantee. As long as there are still stateroom assignments left in your category though, guaranteed staterooms are not available to be booked.