Assign the IP 10.0.3.21 as a custom ephemeral IP address to the licensing server.

Launch the licensing server with an automatic ephemeral IP address, then convert it to a static internal IP address.

Reserve the IP 10.0.3.21 as a static public IP address using gcloud and assign it to the licensing server.

Reserve the IP 10.0.3.21 as a static internal IP address using gcloud and assign it to the licensing server.