“the transaction ID does not match for this developer account” error when transferring your Android app between Google Play Developer Accounts: how to fix it?

the transaction ID that made it all go to hell.

I recently had to move an Android app from one Google Play Developer account to a newer one that was created to match a new formal entity at work. During the transfer attempts of the app, I noticed this weird error:

the transaction ID does not match for this developer account

The error is stating that the transaction ID that I was using to verify who the receiver of the app would be, was not correct while I actually followed Google’s support steps precisely.

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TL;DR

Remove the text before the “registration-” string if you have the same long ID as I had (the text in the blue box is the text from the ID you need to copy and use for the transfer request):