Hi @Prudhvi Keertipati ,this thread details how you can do this:
"Unfortunately there's no default sign out flow for B2C, but you can workaround this by redirecting your app to do a sign out.
You can redirect the users to redirect the user to the end_session endpoint that is listed in the OpenID Connect metadata document.
Like for Tenant : Fabrikamb2c.com the metadata would be at https://fabrikamb2c.b2clogin.com/fabrikamb2c.onmicrosoft.com/b2c_1_sign_in/v2.0/.well-known/openid-configuration
You can then select the end_session_endpoint URL. something like this : GET https://{tenant}.b2clogin.com/{tenant}.onmicrosoft.com/{policy}/oauth2/v2.0/logout?post_logout_redirect_uri=https%3A%2F%2Fjwt.ms%2F]
If you use the post_logout_redirect_uri parameter (optional), the user would be redirected to that URL after a successful sign out. It can be a custom URL for your Webpage. Unless you provide an id_token_hint, you should not register this URL as a reply URL in your Azure AD B2C application settings.
You can read the sign out process here."
The linked thread has some other replies you can take a look at as well. Please let me know if this helps. If not I can help you further.
Thank you,
James