Additional team and channel-related features and issues within Microsoft Teams for business
Hello, SharathChandra4
I am Igor and I will be glad to help you with this question :)
Have you tried to reinstall the Teams app on your iPhone device?
You can also try to follow the steps below:
Navigate to your device settings
Scroll down to acess the apps and find Teams app
Swipe down and tap on clear app data
Then restart Teams app and sign in again.
Let me know the results
Best Regards