This questions should be posted into "products". "Community help" is for questions about the community itself.
You are providing too little info for us to be able to help you. We would need to know the domain and subdomain (anyway, this is public information as it is spread worldwide through DNS ) and screenshots of the domain and error in Marketo.
Elien, can you move this to the correct place Products like Greg said? I don't want to leave an answer in the wrong place as it will not be helpful to future searches.