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If you're setting up a new Fediverse server, you may run into technical difficulties if you re-use a subdomain or domain from a server that has now closed. More info about this at:

https://fedi.tips/can-i-re-use-an-old-subdomain-or-domain-when-installing-a-brand-new-fediverse-server

TL:DR - You can avoid technical problems by always using a brand new subdomain whenever you set up a new Fediverse server. It's okay to be the subdomain of a previously used domain, as long as the subdomain itself is new.