Ok...Here it goes.
Instead of contacting them I just went ahead and requested a pre-planed unlock for a authorization-required zone (...as if I was planning a mission for that zone without internet connection on location...)
The procedure is outlined here:
and this is the page I accessed (Tab "Self Unlock")
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If one has a credit card on file with them the verification can be made either with it or via SMS to phone, as shown in the video.
If one does not have the credit card on file (...my case...), only the SMS option will appear.
I went ahead and requested an unlock for a specific zone in my country and, sure enough, the process went through using my phone.
All I remain to figure out is: When the process was finished, the site informed that I would able to see the authorization in the app (GoFly4) and, until now I have not been able to locate it.
MK
EDIT: Ok, also figured this last part:
GoFly app ---> Bottom bar "Me" ---> Vertical Menu "More" ---> "My Unlock NFZ Application" (requires a separate login)
The standing authorizations are listed there