Please see:
https://support.microsoft.com/en-us/windows/add-an-app-to-run-automatically-at-startup-in-windows-10-150da165-dcd9-7230-517b-cf3c295d89dd

Press the Windows logo key  + R, type shell:startup, then select OK. This opens the Startup folder.

Create a Tdarr Tray shortcut and copy and paste the shortcut into the Startup folder.
