Few more questions then:
- are you installing this plugin on https://styleflow.nl ? or any local development?
- is this website able to contact api.blogcopilot.io url?
I hardly see any track of this domain calling above url from this domain (no track of http requests), so possible case can be local development or firewall blocking the access to this api.
If above is not the case, please write to us at [email protected], where we could trouble-shoot this further.