Unable to change subdomain used for workers

(cross-posted to the discourse - https://community.cloudflare.com/t/unable-to-change-subdomain-used-for-workers)

Hi folks,

I’m trying to change the subdomain for all my workers from the overview page & then clicking change on the right hand side under subdomains. As per the screenshot, I’m receiving an error of the domain being unavailable. Is there any way to figure out why it’s unavailable/what’s blocking the change?
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