Hello
It seems ot be a rights issue, please logged with the sameuser than DP inet service is running run powershell command
Get-Spfarm
You must get similar error message. Those are user requeriments detailed into integration guide.
Configuring user accounts
Create or identify a Windows domain user account that has Windows administrative rights on the Microsoft SharePoint Server system on which you plan to execute the Data Protector commands. This user must also be granted Microsoft SharePoint Server administrative rights and must be added to the Data Protector admin user group.
Best Regards