Failed first FET cycle ERA

Hi all. We found out today that our first cycle failed. We transferred a 5AA pgs tested embryo and everything has looked good for me throughout the cycle. We have MFI and everything else has been going well so far so our doctor was pretty hopeful this transfer will work. I am so confused and so is my doctor. We are thinking of doing an ERA to try to get some answers. Anyone done era before? Is it true that you may need multiple tests?