pleroma.debian.social

Many fediverse sites only have an IPv4 address, which may not seem to matter, as people with an IPV6 only device (such many mobile phones) can still access them as a client via their provider mapping to IPV4 on network exit. For twitter.com this does not matter, but an IPv4 only site can not Federate with an IPV6 only site. Please read RFC 9386 - IPv6 Deployment Status and ask your Ipv4 only server to act.