Hi there, thanks for the screenshot. How long it's been you've claimed the URL? Also, have you followed the steps mentioned in this Help Center article while doing so: https://goo.gl/9gRZWb ? Keep us posted.
Sorry for the confusion. Custom URLs only redirect users to the channel's default URL, so this is working as intended. That said, use our "Send Feedback" tool to submit a feedback, here's how: https://goo.gl/WdI0BK . This is how we collect and prioritize requests.