PowerBi Report Server Licence Key (via SQL EE) invalid

[Reinhard68]

Hi!
I've installed Microsoft PowerBI Report Server 1.17.8552.27722 with 180 days test licence on a box with SQL Server 2019 EE (Microsoft SQL Server 2019 (RTM-CU18-GDR) (KB5021124) - 15.0.4280.7 (X64) Core-based Licensing (64-bit)

on Windows Server 2022 Standard 10.0 <X64> (Build 20348: ) (Hypervisor) ).

Now I am looking for the licence (product key), which is included with SQL Server EE.
But the key, which is shown in the M365 Admin Center

SQL EE core - download - special instructions (here in German)

is not accepted :

Any ideas?
Thanks!