We can help remove that domain, but we need to verify ownership first. Please add a TXT record at _railway.verify.<your-domain> (replacing <your-domain> with the domain you mentioned) with the value k7mf9x3w, then reply here once it has propagated.

Im done please process!

Thanks for setting up the TXT record, I could see it on your DNS so ownership checks out.

I've removed the old registration for colab.2z2.top. The domain is free now and you can add it to your service right away. Feel free to delete the _railway.verify TXT record too, it's no longer needed.