@Geetika_Dwivedi Thank you for the feedback,
Currently this is not supported, but I can see this being useful in other cases too (for instance, clicking “Go to Post” in email notifications won’t direct you to the post if you haven’t logged in).
We have an open pull request, where if the user signs in with a link to a specific channel, they will be redirected to the correct channel after a successful login: https://github.com/mattermost/platform/pull/6304.
If we opened a Help Wanted ticket for a similar improvement (if the user signs in with a link to a specific POST, they will be redirected to the correct post after a successful login), would you or someone in your team be interested helping with it?