User Licenses: Why Is There Only An Option To Select Chatter External, Chatter Licenses For A User?
When creating a user, only "Chatter External" and "Chatter Free" licenses may appear as options. This situation indicates that all available "Salesforce Platform" licenses have been allocated. To verify the number of available licenses, navigate to the Company Information page within the organization. New licenses can be acquired by contacting the appropriate account executive.