I was trying to create my website’s Twitter Cards but the validator warned like below when I submitted ‘Request Approval’ form for my domain:
Something went wrong and your request to be added to the whitelist failed. Please try again.
Reason: is not a valid screen name
It seemed the validation was ok because all the light were green except optional Mobile App Integration part.
Can you please have a look at my Twitter Cards settings? The url I was trying to validate and ask for an approval is http://stripes.co.kr/products/premium-italian-blue-windowpane