To integrate TPIR for multiple users on Microsoft 365 follow the below steps :
Step 1. Login into your Microsoft 365 admin center and go to Settings (left-hand panel).
Step 2. Now go to Integrated Apps under Settings.
OR
Go to Search Bar and type Add-in and click on Integrated Apps.
Step 3 : Select the Integrated App and it will redirect you to a new a page. Here, click on Upload Custom Apps.
And this is how you can deploy/setup the TPIR Plugin.