The last few days, the omnik portal and app and API have been unavailabe. So the data loggging is not possible at the moment. I have found out Omnik dataloggers log to the database of SolarmanPV. It seems you can still see your live output and history.
The URL is https://www.solarmanpv.com/portal/LoginPage.aspx and you can use your omnik portal credentials. I am working to get the API working so the software can be updated. Unfortunally there is only a working unsecure API interface. There is a secure alternative, but an API-key is needed for that. I am working on this.
Have some patience, I will come with a working update coming days.