Every tour accessed with your domain must have a whitelabel URL entered in its Settings. Please edit the tour showing this message and click Brand Kit and enter the URL so that the tour can be accessed.
This error is seen if the following actions are performed:
Create Tour A.
Enter whitelabel URL in Brand Kit for Tour A. URL is approved.
Create Tour B.
Do not enter whitelabel URL in Brand Kit for Tour B.
Try to access Tour B.
To resolve the error, simply enter the whitelabel URL on Tour B. Every tour must have a whitelabel URL entered if it is to be used with your domain.