@ajithd6368 ,
There are two ways to send Teams notifications from Flow, I suppose you have tried the first one.
The Post a message in a chat or channel action can send a message in the following two ways:
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As the Flow bot: In this method, the message gets sent as the Flow bot instead of any individual users. Use this sender option if you didn't want to tie the message to any specific user and just want to use a generic sender instead.
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As a User: In this method, the message gets sent as the user who's signed in to the Teams connector in the Flow (generally the Flow owner). This method can be used when the message needs to get sent as a regular user.
The Post as and Post in options within the action control all the different combinations of how messages can be posted in Teams.