For the Connexys application also applies that a Salesforce user license determines the baseline of features that the user can access. Every user must have exactly one Salesforce user license. You assign user permissions for data access through a profile and optionally one or more permission sets (source: Salesforce).
Standard User Licenses
Find here information about standard user licenses that you can get for your organization, such as the Salesforce user license and Lightning Platform user license types.