Apple DEP - Server Registration not possible

Hello,
i'm trying to setup our new SMC and i wan't to Register my Apple DEP / MDM Server.

If i download my public key from my SMC (apple_dep_kpub.pem) and try to load it up in the new Apple Buisness Manager (DEP isn't any more),
i'll get the following error after uploading the public key :

"This is no valid key. Please try again"

So it's not possible to Setup the MDM Server and getting a new certificate for the SMC upload.

Are there any ideas how i can fix it?


I also followed the guide on the Homepage step by step…..but the public key from smc isn't working.