This should help: Zabbly Incus will not install on Ubuntu Pro subscribed hosts
My output for apt policy incus looks like this:
$ apt policy incus
incus:
Installed: 1:6.14-ubuntu24.04-202507110422
Candidate: 1:6.14-ubuntu24.04-202507110422
Version table:
*** 1:6.14-ubuntu24.04-202507110422 500
500 https://pkgs.zabbly.com/incus/stable noble/main amd64 Packages
100 /var/lib/dpkg/status
1:6.14-ubuntu24.04-202507012155 500
500 https://pkgs.zabbly.com/incus/stable noble/main amd64 Packages
1:6.14-ubuntu24.04-202506291645 500
500 https://pkgs.zabbly.com/incus/stable noble/main amd64 Packages
6.0.0-1ubuntu0.2+esm1 510
510 https://esm.ubuntu.com/apps/ubuntu noble-apps-security/main amd64 Packages
6.0.0-1ubuntu0.2 500
500 http://archive.ubuntu.com/ubuntu noble-updates/universe amd64 Packages
500 http://security.ubuntu.com/ubuntu noble-security/universe amd64 Packages
6.0.0-1 500
500 http://archive.ubuntu.com/ubuntu noble/universe amd64 Packages