For a deeper look into our World Check One API, look into:
Hello @Panagiotis.K,
I believe you will have to re-register, with the correct email address.
The registration email address is important, it determines what materials you can access: client organization-registered emails can get access to all the resources of the dev portal (we know what organization you are with) while private email registrations- get access to some of the resources (we do not know who you are).