I've never seen this issue before, but am willing to try help you out based on my presumptions.
In the Power Platform admin center: Power Platform admin center (microsoft.com)
Try and create a new Dataverse (prev. known as Common Data Service) database, if it is not already created.
I believe a "standard database" is usually created when your organization has setup/configured the Dynamics 365 service or if other Power Platform apps has been used before in the tenant before a standard Dataverse DB has been created...
I might be wrong, correct me if I'm wrong. (Worth a try).
GK