Since, OOB Data Connector to connect Dynamics CRM is removed from Microsoft Teams. One way to make this connection happen is through Microsoft Flows. However, this is a one-sided connection which means you can trigger an event on Dynamics CRM to send a notification to the Channels on Teams.
It would be useful to make this connection available otherway round. For eg, If I send a reply or attachement to the notification message on Teams, it should sync up to Dynamics CRM in form of a Task or Attachment to the Entity Record