Subdomains in a Glitch project

I have a Glitch project: https://xxprogamerxx.glitch.me/ and I’d like to add a subdomain to it. I have tried express-subdomain. I have set up a subdomain keychain (https://keychain.glitch.me) but when I visit the link I get this page

Is their anyway I can have a subdomain for my express Glitch project (not the *.glitch.me) without creating a new one?

No, we don’t support sub-domains of sub-domains. We recommend you use sub-directories instead.