Cannot install nightly flatpak

[TheAnnoyingFruit]

Describe the bug

When trying to install the nightly flatpak package am met with this: "Warning: While pulling runtime/moe.sable.client.Nightly.Locale/x86_64/master from remote sable-nightly: Commit 6b5ab703c3b30de1fcf75edd02f72fb3d348f8d0cf5a19cfb1c685cf81faa92a: GPG verification enabled, but no signatures found (use gpg-verify=false in remote config to disable)
error: Failed to install moe.sable.client.Nightly: While pulling app/moe.sable.client.Nightly/x86_64/master from remote sable-nightly: Commit 3c9f1c047740e35698ac584fc7e4c3a1a2abee151984435d82bf2a8115b876aa: GPG verification enabled, but no signatures found (use gpg-verify=false in remote config to disable)".

Reproduction

1. Add nightly flatpak repo.
2. Install flatpak fails

Expected behavior

Installs

Platform and versions

Bazzite

Additional context

No response