Teams connector configuration issue

stackoverflow.js

On my configuration page (https://c878f667.ngrok.io/msteams/connector-landing)
I am registering an onSaveEvent handler, that should save the configuration like this:

-------------------------------------------------------------

var mysettings = {
   entityId: webhook.id,
   configName: configName,
   contentUrl: LANDING_PAGE_PATH,
   removeUrl: LANDING_PAGE_PATH
};

teamsSdk.initialize();

teamsSdk.settings.registerOnSaveHandler(function(saveEvent) {
   teamsSdk.settings.setSettings(mysettings);
   // This gets executed. I checked
   saveEvent.notifySuccess();
});

----------------------------------------------------------------

This fails with the following message:

Received error from connectors: {  
   "seq":1550133560094,
   "timestamp":1550148789111,
   "flightSettings":{  
      "Name":"ConnectorFrontEndSettings",
      "AriaSDKToken":"d127f72a3abd41c9b9dd94faca947689-d58285e6-3a68-4cab-a458-37b9d9761d35-7033",
      "SPAEnabled":true,
      "ClassificationFilterEnabled":true,
      "ClientRoutingEnabled":true,
      "EnableYammerGroupOption":true,
      "EnableFadeMessage":false,
      "EnableDomainBasedOwaConnectorList":false,
      "EnableDomainBasedTeamsConnectorList":false,
      "DevPortalSPAEnabled":true,
      "ShowHomeNavigationButtonOnConfigurationPage":false
   },
   "status":500,
   "clientType":"SkypeSpaces",
   "connectorType":"45302fba-8ce9-432d-a6c0-807e08ac8cbd",
   "name":"handleMessageError",
   "nonPIIInfo":"{\"exception\":{}}"
}


---------------------------------------------------------------
After some digging I found:

The configuration sent to the connector API (take from REST):
It seems to me that the required validDomain is not passed to Teams despite being configured in the connector dashbaord.

{  
   "ProviderId":"45302fba-8ce9-432d-a6c0-807e08ac8cbd",
   "ImageContent":"data:image/jpg;base64,....",
   "IsDesktopClient":false,
   "ValidDomains":";https://teams.microsoft.com;https://teams.microsoft.us;https://int.teams.microsoft.com;https://devspaces.skype.com;https://ssauth.skype.com;https://www.merlot.city;https://www.merlot.life",
   "ConfigurationContentUrl":null,
   "ConfigurationUrl":"https://c878f667.ngrok.io/msteams/connector-landing",
   "EntityId":null,
   "AppType":"Teams",
   "UserObjectId":"6ff32f78-ce1c-4ec2-907d-3f760bddbe60",
   "WebhookUrl":"https://outlook.office.com/webhook/c9cc87d6-ca9b-4c2f-8bf5-5a2ac9128e1b@d46622ad-f7da-4786-ae59-bd9ac5ae5da8/45302fba-8ce9-432d-a6c0-807e08ac8cbd/045bc96820ef47229b80f264a5b0bf69/6ff32f78-ce1c-4ec2-907d-3f760bddbe60",
   "FriendlyName":null,
   "IsCreateFlow":false,
   "AlternateId":"045bc96820ef47229b80f264a5b0bf69",
   "ProviderName":"ConnectToO365Inline",
   "ProviderDisplayName":"New Connector",
   "IsNewProfile":true,
   "IsIncomingWebhookType":false,
   "ConnectorConfigurationId":null,
   "IsConnectedAccountsSupported":false,
   "ChooseAccountDescription":"Choose the New Connector account you want to use to configure this connector, or add a new account.",
   "ConnectorDetailedDescription":"Different tools suit different tasks, just like different people feel comfortable with different tools. Whether you\u0027re scheduling meetings, tracking your project\u0027s progress, brainstorming new design ideas, or crunching numbers, there\u0027s a view for you.",
   "ForwardToEmail":"c9cc87d6-ca9b-4c2f-8bf5-5a2ac9128e1b@d46622ad-f7da-4786-ae59-bd9ac5ae5da8",
   "ForwardToFullQualifiedObjectId":"c9cc87d6-ca9b-4c2f-8bf5-5a2ac9128e1b@d46622ad-f7da-4786-ae59-bd9ac5ae5da8",
   "GroupName":"Unbroken Team",
   "IsOwnerOfConfiguration":true,
   "IsConfigurationInBadState":false,
   "NeedToRecreate":false,
   "UserConnectedAccounts":[],
   "SelectedConnectedAccount":null,
   "SelectedConnectedAccountId":null,
   "ConnectorConfiguration":null,
   "ServiceAccountName":null,
   "ServiceAccountUniqueId":null,
   "SelectedChannelId":"19:47233c2a202d4349b00a14c789e7521b@thread.skype",
   "ClientType":"SkypeSpaces",
   "ErrorMessage":null,
   "ObservedProperties":null,
   "FrequencyList":[ ... ],
   "Screenshots":null,
   "PopupNeededForConsentPageInOlk":false,
   "OrgPrivacyPolicyUrl":"https://go.microsoft.com/fwlink/?LinkId=512132"
}