Hi @Arthur Engelmann ,
This sounds potentially like a permissions issue. In order to view the findings of the vulnerability assessment, your account needs to have the Security Reader role assigned as well as Owner permissions at the resource group level. You also need to have the Defender for Servers Plan 1 or Plan 2. If you want to disable specific findings, you need permission to edit a policy in Azure policy. To disable a recommendation, you need to have the Security Admin role.
If you already have the correct permissions but still are unable to resolve the assessments, feel free to send me an email at AzCommunity@microsoft.com ("Attn: Marilee Turscak") and include your subscription ID and a link to this thread, and I can get a support case opened to address your scenario.
If the information helped you, please Accept the answer. This will help us as well as others in the community who may be researching similar information.