PowerApps - what could be licensing requirement for me to create entities in CDS?

I exported a SharePoint list to Excel and then tried Data -> Entities -> Get Data to create entities in CDS uploading data from Excel. It says 'You are missing privileges to create entities in this environment.' What could I do?

Possibilities of this error while creating entity are:

1. You are trying to create entity in some environment where you don't have security role/privilege to do this operation, viz Environment Admin, System Admin, System Customizer or custom Admin role
2. Trying this operation in Default or a CDS environment without database provisioning (highly unlikely)
3. Probably you have Environment maker role, client assumes that it is enough which is not the case

Try to get Admin privileges in Dev/sandbox environment from your client or create a trial org to try out things. You may have license but the basic role to access the system as an end user will not help you to do such stuffs.