Webhook monitor on dev cohort does not work

It appears that the webhook monitor add-in does not work on the dev cohort account.

Clicking on the link brings up a blank sidebar. There does appear to be a call to a link that returns a 400.

https://sta-pusa01.app.blackbaud.net/testr/v1/wt/addin/eventTypes?envid=p-vnVAbDtfu0GyMqSDmG-_qw&svcid=renxt&bbcid=renxt%2Cspa-sta-tester-webhook-app-addins&product=undefined

Response

{
"errors": {
"product": [
"The value 'undefined' is not valid."
]
},
"type": "urn:blackbaud:model-validation-error",
"title": "One or more validation errors occurred.",
"status": 400,
"detail": "The value 'undefined' is not valid.",
"instance": "urn:blackbaud:sta-testr:product",
"values": {
"product": "undefined"
},
"trace_id": "7690667fb2056d14a1f60bc807911f86",
"span_id": "0d8499d9bf60ac3a"
}