Problem with CloudDB

Hello everyone,
I bought a CloudDB and I tried to connect it with my dedicated Server where Plesk is installed.
Everything Okay, but if I try to add the database server I got an error

Fehler: Die Testverbindung zum Datenbankserver ist fehlgeschlagen, da das angegebene Konto keine Administratorrechte besitzt:

SQLSTATE[42000]: Syntax error or access violation: 1044 Access denied for user 'plesk'@'%' to database 'd5f9d4afabebf1'

Can you help me, please?

Greetings