SmartApp Registration fails verification - never ever hits my web app

Apps & Clients
,
1

I assure that my URL is public and is backed by a valid and trusted certificate. I can hit it up from anywhere. But when creating a SmartApp and trying to verify/register, the WebHook URL is never hit. I get no traffic at all. I use node/express with full debug turned on and I get nothing.

Are there any debug paths to take on the SmartApp verification that I could look at to troubleshoot? It offers no logs at all, just says “failed”. When I use the smartthings CLI and do:

> smartthings apps 023aa6cd-ef78-421f-bb60-20baa3d8a86b -j

i get:

{

  • “appName”: “automation7-1676317889203-616”,*
  • “appId”: “023aa6cd-ef78-421f-bb60-20baa3d8a86b”,*
  • “appType”: “WEBHOOK_SMART_APP”,*
  • “principalType”: “LOCATION”,*
  • “classifications”: [*
  •    "AUTOMATION"*
  • ],*
  • “displayName”: “automation7”,*
  • “description”: “automation7”,*
  • “singleInstance”: false,*
  • “installMetadata”: {*
  •    "assumedRoleCanInstall": "false",*

  •    "maxContentLengthBytes": "64000",*

  •    "maxInstalls": "500",*

  •    "certified": "false"*
  • },*
  • “owner”: {*
  •    "ownerType": "USER",*

  •    "ownerId": "461ce09b-458f-7741-9c26-eb92479418a4"*
  • },*
  • “createdDate”: “2023-02-13T19:51:28Z”,*
  • “lastUpdatedDate”: “2023-02-13T20:07:34Z”,*
  • “webhookSmartApp”: {*
  •    "targetUrl": "https://xxxx.xxxx.com:11908/automation7",*

  •    "targetStatus": "PENDING",*

  •    "signatureType": "ST_PADLOCK"*
  • },*
  • “ui”: {*
  •    "pluginUri": "",*

  •    "dashboardCardsEnabled": false,*

  •    "preInstallDashboardCardsEnabled": false*
  • }*
    }