No key ring access from within Flatpak

When running the app as a Flatpak, the key ring is not used:

static bool LibSecretKeyring::findPassword(const QString&, const QString&, QKeychain::JobPrivate*)
** Message: 14:21:08.781: Remote error from secret service: org.freedesktop.DBus.Error.ServiceUnknown: org.freedesktop.DBus.Error.ServiceUnknown
OpenTodoList.KeyStore: Failed to read credentials for "{xxxxxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx}" : "org.freedesktop.DBus.Error.ServiceUnknown" - trying fallback