Wildcard DNS let user custom there domain

I would like to know how to let's my users custom domain with CNAME to my domain



mydomain.com or support.mydomain.com

BUT ALWAYS 404 on support.userdomain.com
BUT IT'S WORK on support.mydomain.com
can you please provide real domains?
unclelife.co now *.unclelife.co it's not work
sorry railway does not yet support this usecase since they do their routing based on the host, but if your user makes a request from their domain the host will not exist in railways router and you will get a 404
youd have to do some host masking with cloudflare or something along that line
Thank you.

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