I haven't recently changed config files or anything like that or settings until this happened, but I was on my website and when I reloaded the page I got a 502 bad gateway and I have been trying to fix it for a few days until I noticed that my custom domain name no longer shows up in the settings tab and when I try to add it back I get told it is not available. I'm not entirely sure what this means but I have not changed that subdomains DNS records since I originally added it to the prod environment