Microsoft Teams Connector unable to save configuration

Question

I'm trying to build a Microsoft Teams connector that I have sideloaded into my team while developing. I've set up a testing config page on S3 and have pointed my app manifest to it. When I click the save button, it stays stuck on the "Setting up your connector" spinner for a while, before saying "Unable to save connector configuration. Please try again."

The Javascript of the config page should be visible through the S3 link above; my app manifest is below. After looking at a few similar questions, you'll note that the contentUrl is included by wildcard in validDomains.

{
  "$schema": "https://developer.microsoft.com/en-us/json-schemas/teams/v1.7/MicrosoftTeams.schema.json",
  "manifestVersion": "1.7",
  "version": "1.0.0",
  "id": "0b73c39a-db1d-43eb-81bd-3813bef33713",
  "packageName": "<redacted>",
  "developer": {
    "name": "Developer",
    "websiteUrl": "<redacted>",
    "privacyUrl": "<redacted>",
    "termsOfUseUrl": "<redacted>"
  },
  "icons": {
    "color": "color.png",
    "outline": "outline.png"
  },
  "name": {
    "short": "Test",
    "full": "Test"
  },
  "description": {
    "short": "Test notifications",
    "full": "Test notifications"
  },
  "accentColor": "#FFFFFF",
  "connectors": [
    {
      "connectorId": "0b73c39a-db1d-43eb-81bd-3813bef33713",
      "configurationUrl": "https://wsk-teams-test.s3.amazonaws.com/teams_configure.html",
      "scopes": [
        "team"
      ]
    }
  ],
  "permissions": [
    "identity",
    "messageTeamMembers"
  ],
  "validDomains": [
    "wsk-teams-test.s3.amazonaws.com",
    "<redacted>"
  ]
}

I'm not able to get any more detailed information when attempting this via the desktop Teams app, but in the browser I see this error in the console:

2020-09-02T23:05:20.879Z Received error from connectors {"seq":1599086774636,"timestamp":1599087920857,"flightSettings":{"Name":"ConnectorFrontEndSettings","AriaSDKToken":"<redacted>","SPAEnabled":true,"ClassificationFilterEnabled":true,"ClientRoutingEnabled":true,"EnableYammerGroupOption":true,"EnableFadeMessage":false,"EnableDomainBasedOwaConnectorList":false,"EnableDomainBasedTeamsConnectorList":false,"DevPortalSPAEnabled":true,"ShowHomeNavigationButtonOnConfigurationPage":false,"DisableConnectToO365InlineDeleteFeedbackPage":true},"status":500,"clientType":"SkypeSpaces","connectorType":"0b73c39a-db1d-43eb-81bd-3813bef33713","name":"handleMessageError"}

Thanks for any guidance you might have. If I can get in touch with someone from Microsoft privately, I'd be happy to provide the <redacted> information.

Answer 1

This issue is fixed by adding the content url in valid domains list in the Connector Developer Dashboard.

Answer 2

As recommended above: This issue is fixed by adding the content url in a valid domains list in the Connector Developer Dashboard. This helped me understand the direction of the problem. But my accidental mistake was due to the lack of the prefix https:// Be sure to add https:// prefix to your domain