While in the process of adding a security policy (with a destination zone of 'Multicast' and the multicast IP address 224.0.0.251, and port is udp/5353) on the device, adding 224.0.0.251 to the Group List in Multicast > Rendezvous of the default virtual router. When committed, the following error is displayed:
Multicast group address 224.0.0.251/32 is not valid.(Module: routed). Commit failed.
Resolution
The commit is failing because multicast range 224.0.0.0/24 is reserved for local multicast. It is not to be used, as the IGMP address receives the mcast traffic.