I just used the Workers->Overview->Account Details->Subdomain function to change the custom subdomain for my workers. The form itself worked but now all my workers are broken - they are no longer accessible under the old OR new subdomains. I get “DNS address could not be found” errors.
I did notice that there’s a section inside each worker’s “Routes” where the subdomain is explicitly shown, and there was a period where this was listed as in progress. It’s now been “Active” for over an hour but the new URL still doesn’t work. Is there a specific time period this should take?