Hello Nirav,
My name is Joanna, I’ll be happy to help you out today.
Please follow the methods below that may help you solve the issue.
A: Manually Disable Teams from Opening on Startup
You can manually disable Microsoft Teams auto start in its settings. Open the Teams app and go to Settings > General > Application. Uncheck the Auto-start application option. Restart the Microsoft Teams app.
B: Disable from Task Manager
1. Press Ctrl + Shift + Esc key to open Task Manager.
2. Go to Startup tab.
3. Click on Microsoft Teams, and click on Disable.
C. Change settings
You can the settings in Microsoft Teams and see if that helps:
1. Launch Microsoft Teams.
2. Click on the Profile icon on the top right corner and click on Settings.
3. Scroll down and clear the checkbox for Auto Start Application.
For the other methods, please refer to the links below.
https://answers.microsoft.com/en-us/windows/for...
https://www.prajwaldesai.com/disable-microsoft-...
Disclaimer: The link above is a non-Microsoft website. The page appears to be providing accurate, safe information. Watch out for ads on the site that may advertise products frequently classified as PUP (Potentially Unwanted Products). Thoroughly research any product advertised on the site before you decide to download and install it.
Please let me know if this doesn't work or if you need further assistance.
Thank you.