You can follow the help documentation here for assign roles to users and teams. https://help.sap.com/docs/SAP_ANALYTICS_CLOUD/00f68c2e08b941f081002fd3691d86a7/44b47657d843475581824fb328156e7d.htmlHere are the set of standard application roles in SAC....
It has to do with your user roles. I suspect your user has only viewer role and for creating you need digital boardroom creator role. Get the standard role assigned or add the required permissions to a custom role and add that to your user.