IBM API Connect Integration not retrieving org/space when configuring the integration

When configuring an integration to IBM API Connect following the steps described here: https://support.smartbear.com/swaggerhub/docs/integrations/ibm-api-connect.html 

After adding the API Key and clicking authenticate the Organization Name and Space are not retrieved from IBM API Connect. The Dropdown box appears but does only contain an empty line and I cannot continue.

See Video Tutorial on that page at 1:15.

I tried different browsers and also generating a new API Key in IBM API Connect.

Probably something changed in API Connect which prevents the org/space from being retrieved.

Hoping for a quick fix...