Visma eAccounting developer sandbox module not working

I get this message when I try to connect to Visma a-accounting using a developer sandbox account:

Log in to Visma’s services
The service is unknown or authorization to login is missing. Try again. If the problem persists, note the tracking ID and contact us.

Tracking ID: 23d37da5-bff3-4fe8-94a2-0f377ad897da

Regular account/module works fine. Please advise, Thanks