Find user on incoming web-hooks

mukesh-pando -
Using Incoming webhook you cannot find the username or user email.
Currently, this is not possible scenario.
If you can send the adaptive card through Bot then you will get the user value.

   protected override async Task OnMessageActivityAsync(ITurnContext<IMessageActivity> turnContext, CancellationToken cancellationToken)
    {   
        // Gets the account of a single conversation member.
        // This works in one-on-one, group, and team scoped conversations.
        var member = await TeamsInfo.GetMemberAsync(turnContext, turnContext.Activity.From.Id, cancellationToken);
    }

Reference sample- Microsoft-Teams-Samples/DialogBot.cs at main · OfficeDev/Microsoft-Teams-Samples (github.com)