A 2019 1040 file was authorized for PPR when I filed the extension. I now have the 2018 return complete and want to transfer it to 2019. Can I do that without having to authorize again?
I dont think so. Your original 2019 return will get overwritten with the one you're transferring in.
Is it a complex return with lots of carryovers and things that really need to get transferred into 2019?
You may need to call support and have them give you a manual PPR code to bypass the second request for payment.