Cannot connect to S/4HANA Cloud instance (Embedded Steampunk)

Hello everyone,

I would like to try out the new ABAP Environment on S/4HANA Cloud (Embedded Steampunk). After trying to log on to the system using ADT I get the following error:

No authorization to access the resource /sap/bc/adt/core/http/reentranceticket.

Do I have to set something else on S/4HANA Cloud or in my user to reach the ABAP Environment from ADT?

Thanks in advance.