Dear all,
I created an own account for SAP Business Technology Platform using the Pay-as-you-go-model. Now I try to create a new ABAP Environment instance (free tier) using the related Booster.
The creation of the system instance is successful and I created a Service Key using the following template:
{
"email": "yyy@outlook.com"
}<br>
When I try to use this Service Key in order to access the system via the ABAP Development Tools, I get the following error message (after clicking the link to get logged in which states that the login was succesful).

I do not know how to fix this issue.
In the section "Security > Users", it looks like this:

The assigned Role Collections for both mentioned users look like this:

The settings in the Trust Configuration look like this:

Does anyone has an idea how to get access to this system using ADT?
Thank you very much!
Jens