PayPal Notification

Hi
My client just received a notification from PayPal that I do not understand but it appears to be related to the website settings?
Hoping you can provide direction on this.

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

https://na01.safelinks.protection.outlook.com/?url=http%3A%2F%2Fseanbarrette.ca%2F&data=05%7C02%7C%7Cc7af10103033434e45c108dd092a25b1%7C84df9e7fe9f640afb435aaaaaaaaaaaa%7C1%7C0%7C638676798799650556%7CUnknown%7CTWFpbGZsb3d8eyJFbXB0eU1hcGkiOnRydWUsIlYiOiIwLjAuMDAwMCIsIlAiOiJXaW4zMiIsIkFOIjoiTWFpbCIsIldUIjoyfQ%3D%3D%7C0%7C%7C%7C&sdata=sC4kKt5YNCVlgx3eg%2FWuAfm8EGQ7rzrdTl6QqWFfsMg%3D&reserved=0>/index.php?option=com_j2store&view=checkout&task=confirmPayment&orderpayment_type=payment_paypal&paction=process&tmpl=component

If you do not recognize this URL, you may be using a service provider that is using IPN on your behalf. Please contact your service provider with the above information. If this problem continues, IPNs may be disabled for your account.