C# .NET: Server is not able to validate Angular Client [IdentityServer]

So I have the following setup:

Frontend: AngularJS App

Backend: WebApi with Identity Server to validate clients

In my Backend I create a new in-memory client like so:

new Client
{
    Enabled = true,
    ClientId = "myapp.mycompany",
    ClientUri = "https://myapp.mycompany.com",
    ClientName = "My Client",
    Flow = Flows.Implicit,
    AllowAccessToAllScopes = true,
    IdentityTokenLifetime = 300,
    AccessTokenLifetime = 3600,
    RequireConsent = false,
    RedirectUris = new List<string>
    {
        "https://myapp.mycompany.com/assets/idSrv/callback.html",
        "https://myapp.mycompany.com/assets/idSrv/silentrefreshframe.html"
    },
    PostLogoutRedirectUris = new List<string>
    {
        "https://myapp.mycompany.com/index.html"
    }
},

In my front-end I have the following code that declares the client, I use the oidc-token-manager.js client

var authority = 'https://sts.mycompany.com/identity';

return {
    baseUri: protocol,
    tokenConfig: {
        'client_id': 'myapp.mycompany',
        'authority': authority,
        'redirect_uri': 'https://myapp.mycompany.com/assets/idSrv/callback.html',
        'post_logout_redirect_uri': 'https://myapp.mycompany.com/index.html',
        'response_type': 'id_token token',
        'scope': 'openid profile roleScope webApiScope',
        'silent_redirect_uri': 'https://myapp.mycompany.com/assets/idSrv/silentrefreshframe.html',
        'silent_renew': true
    },
    isDebugging: isDebugging
};

When I try to access my website at:

http://myapp.mycompany.com

I get the following error:

The client application is not known or is not authorized.

I have enabled logging, this is what I get:

"Unknown client or not enabled: myapp.mycompany"
 "{
  \"RedirectUri\": \"https://myapp.mycompany.com/assets/idSrv/callback.html\",
  \"SubjectId\": \"unknown\",
  \"Flow\": \"AuthorizationCode\",
  \"RequestedScopes\": \"\",
  \"Raw\": {
    \"state\": \"18141519257414835\",
    \"nonce\": \"8585758378803323\",
    \"client_id\": \"myapp.mycompany\",
    \"redirect_uri\": \"https://myapp.mycompany.com/assets/idSrv/callback.html\",
    \"response_type\": \"id_token token\",
    \"scope\": \"openid profile roleScope webApiScope\"
  }
}"

End authorize request
3001: "Endpoint failure" / "Endpoints" (Failure), Context: EventContext { ..., Details: EndpointDetail { EndpointName: "authorize" }

from C# .NET: Server is not able to validate Angular Client [IdentityServer]