We are on our second set of greys... our rescue told us at some point they would let us know when they were done with the crates.
The first 2 didn’t mind the crates for a good 6 months. But they were older and used to them from being at the rescue for a while before being adopted.
Our second pair (current) are young. We adopted them when they had barely turned 2 and they weren’t at the rescue for more than a day or 2. They INSTANTLY hated the crates so they were only in them for a week.
See how it goes, but I’m not a fan of forcing the crate. Good luck!