Custom URL not working

we changed our username - based on the below is this the reason my link isn't functioning properly? please advise.

Hi there,

Correct, custom URL to stop working if you change your username. You will need to set it up again by following this guide below.

https://www.jotform.com/help/261-how-to-create-a-custom-url-of-a-form?

I hope this helps. Let us know if you need any further assistance.