Issue transferring number to another carrier

I'm having issues transferring a phone number from my AT&T account to Google Fi. I've triple checked all of the information, called AT&T to confirm the account number, name, PIN, and address on the account, and am trying to also work with Google support to see what the issue is. However, on the transfer form I am still being told that the account number, PIN, and first line of the address are wrong. I've tried tons of permutations of things at this point too. Any idea where the real issue is?