For anyone running into the error that the account has not acquired the app you have to do the following:
Live edit the same .zip file in question. Creating an alternative .zip and renaming the file seems to fail.
Using a GUI (BetterZip for MacOS, WinRar for Windows) allows for the ORIGINAL archive (.imazingapp -> .zip) to be modified. So when you save the changes and rename the file back the signature for the app remains intact.
I ran into this error myself, luckily for myself I have some decent diagnostic skills and was able to solve it rather quickly.
Edit: For anyone claiming this doesn't work on 11.1.x or higher I would like it noted that I have gotten it working on 11.3 (beta) and assure you that it does in fact work for all current iOS versions (public or beta).