We use on-premise Exchange for compliance reasons. We have users that want to use MS teams, though, and because I set up an o365 account as a test years ago, Microsoft's o365 account focus makes it difficult. Anytime someone uses their work email address it checks o365 first and gives them an error if they haven't been set up there.
I want to sync my local AD to get past this using Azure Active Directory Connect (https://docs.microsoft.com/en-us/azure/active-directory/hybrid/how-to-connect-install-roadmap#install-azure-ad-connect). Will I need o365 licenses to make this work properly or can I just sync the account info for free so accessing Teams is more seamless?