Yes, Microsoft 365 Business Premium includes Intune license. Also, Endpoint Manager and Intune are the same thing. Please make sure the account is either an Intune service administrator, or a tenant administrator with the global administration permission, meanwhile, the account should have been assigned an Intune license.
Here is the link of assigning a role to an Intune user:
Here are the links of Intune licensing and how to assign license:
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