This is the error i'm getting:
Hi @JanSomers91,
Could you please translate the error message into English language?
The “401 error” told that there is an authentication failure with your custom connector.
Further, which authentication way do you use in your custom connector?
Please check if you have selected proper authentication in your custom connector and provide proper authtication information when you add the connection in Microsoft Flow
Best regards,
Kris