If you go to the item in the SharePoint list and click on the arrow that brings up the menu, you need to click on View Workflow History. There it should provide a link 'Respond To Task'. That will bring up the same approval screen that appears when you click on the link in the email.
Sorry, I couldn't find the link when I opened the View Workflow History. 
Also, is it possible to get the approval URL in a variable because it is available only in the Assign Flexi Task (In common section) and I'm not able to store the value in a variable.
Also, is it possible to construct the Approval URL using Build String? What all parameters are involved in the Approval URL like Web ID, List ID etc.
Thanks,
Shyam
Yes it is. Approval URL is available just like the rest of hte fields. Use a 'Set Variable' action. Create a workflow variable. Use the 'Workflow Context' while in the 'Set Variable' action. Then select the Approval URL.
Example:
Test
Equals Workflow Context Approval URL
Hi Lisa,
It is not available in the drop-down. PFB the image for details.
Hey! Something I thought of that I'm not sure will work but you can try it out. In the Log History when you do Insert Reference the text looks like this:
{Common:Project}. Try replacing Property with ApproverURL. See if you can backdoor it.
Hi Lisa,
I tried replacing the Property but it does not take the URL instead it prints the text : {Common:Approval URL} 
.
Thanks,
Shyam
Oh ok. I give up then. Sorry I couldn't be more helpful.
Nope I did not get a solution to it.
Regards,
Shyam
Thank you so much. 
Will definitely try to implement this.
Thanks,
Shyam
Looking for a solution to this without using JS. I'm using responsive forms onprem, so I can't use custom JS. Because the Task ID isn't set until after the assignee takes action, it can't be used. I want to store the ApprovalUrl in a column for the list (not the workflow task list, but the actual list). This way; I can put it on the list form - directing the assignee to the approval form (if they happen to navigate via the site, rather than clicking the link in the email).
