Submitted forms notification no longer coming to email listed. Stopped abruptly. Please advise

My forms are no longer sending me notifications when people have submitted them. It worked previously and all of a sudden no longer worked please advise.

Hi,

I can see that you have posted the issue multiple times.

Please follow up on my colleague's reply in the link below:

https://www.jotform.com/answers/2888988

Thank you.