You want to use Teams and Business By Design
SAP Business By Design
Download the MS Teams App from either the self service or the Download Center in the Application and user Management.
Please have a look into the following Blog: SAP Business ByDesign for Microsoft Teams (Beta)
Microsoft Teams, Teams, Byd and Team , KBA , AP-RC-UIF-RT-B , ByD HTML5 Client (not for Cloud for Customer) , How To