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Are you sure it is slipped under the catch tab at the bottom correctly and have you checked for anything that would be blocking it?
Hello, I am technicianCustomer/em>
Here is another important thing to look for in your case,
The Trane xr 90 is bad for that, if unit is off level it will definitely give you problems with closing door, you will get it in but if you wish to rectify issue for good, check level and adjust accordingly with shim spacer.