Webhook URL Validation Does Nothing

Our app, which has already been publish, recently had its webhook activity cut off due to us erroneously sending back a 500 response serveral times during the 72hr webhook revalidation attempt.

This has been corrected for about 24hrs now however, we’re unable to revalidate our webhook URL.

Pressing the validation in the app settings page button looks to have no effect and we’re certain only valid responses are being returned.

Please assist/advise