Add MSPbots to Teams Global policy to get the app installed automatically for your current and future AAD users.

Please do the following procedure: 

1. Access office.com as an administrator. 
2. Navigate to Admin > Admin Center > Teams.
3. Select Teams Apps > Setup Policies > Global (Org-wide default), and then click Edit.
4. Select Add Apps, search for MSPbots, and then click Add.
5. Move MSPbots to the top and click Save.