Microsoft Teams lets you add a website as a Tab. You can put the URL of the ArcGIS Dashboard as the tab website URL:
https://www.k2e.com/tech-tips/adding-apps-and-websites-to-teams/
To integrate a website into Teams, begin by clicking the plus sign near the top of the Teams window. Then, instead of choosing a specific app, select the option for Website. In the ensuing Website dialog box, enter the website’s name and URL. Finally, click Save to complete the process.
