You can add the Seneca custom tab app on Microsoft Teams. To do this:
(1) On Microsoft Teams click on the add tab button (the + icon) for the team you want to share Seneca with
(2) Search for "Website" in the "Add a tab" search bar and click on it
(3) Add a Seneca tab
On the "Tab Name" field put "Seneca"
"URL" field put https://app.senecalearning.com/ (WARNING, don't use senecalearning.com as the URL, make sure to use https://app.senecalearning.com/)
Click "Save"
(4) You will now have a Seneca tab for the Team!