Expected Behaviour:
Pi-hole would give out IPv6 addresses to devices, and IPv6 DNS would work as usual.
Actual Behaviour:
New connections to the network since this started happening are unable to use IPv6 DNS (causing some, such as Xbox One, to fail connection. The Xbox says that DNS resolution is not working, but is given an IPv6 address.) Pi-hole is showing the warning no address range available for DHCPv6 request via enp1s0f0 whenever a device tries to obtain an IPv6 address. I've reinstalled Pi-hole and done some research, but haven't been able to fix this yet.
Running sudo dnsmasq returns dnsmasq: failed to bind DHCP server socket: Address already in use. Pi-hole FTL is using these on port 53:
pihole-FT 11015 pihole 8u IPv4 109629 0t0 UDP *:53
pihole-FT 11015 pihole 9u IPv4 109630 0t0 TCP *:53 (LISTEN)
pihole-FT 11015 pihole 10u IPv6 109631 0t0 UDP *:53
pihole-FT 11015 pihole 11u IPv6 109632 0t0 TCP *:53 (LISTEN)
Ubuntu 20.04.3 LTS, Pi-hole version 5.7