Please go to the Receiving tab on the left menu and click Create Route on the top right.

How To Reset The Reply Hook In HighLevel

Step 1: Go to agency level settings > Mailgun

Step 2: Click the edit pencil on the main API key and toggle between any options and re-save

Step 3: Refresh Receiving page in Mailgun to see if the hook was created

How To Manually Set Up The Reply Hook

Step 1: Go to the Receiving tab

Step 2: If there is no webhook there (should look like what's below), click "Create Route" button

Step 3: Configure the following:

If the agency had the client get their own Mailgun account and the forward link needs to be white-labeled, use this: 

What You Should See After Reply Hook Is Setup:

catch_all() Priority: 99