PayPal Instant Payment Notification Warning

Hello, Paypal is not connecting to my IPN page
I received this from paypal:

Please check your server that handles PayPal Instant Payment Notifications (IPN). IPNs sent to the following URL(s) are failing:

Also when I try to visit the link on my site I get a page not found (not sure if that is supposed to happen)

Any help on next steps would be appreciated, we have some functions that are supposed to happen after successful payment which are not currently working.

Hi mat. I recommend opening a support ticket for this issue:

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