Primary-remote on multiple network, remote istio-eastwestgateway pod failed to create because failed to call webhook

Hello, I was following this guide Istio / Install Primary-Remote on different networks on how install primary remote different networks but i got stuck on
Error creating: Internal error occurred: failed calling webhook "": failed to call webhook: Post "https://istiod.istio-system.svc:443/inject/cluster/cluster2/net/network2?timeout=10s": x509: certificate signed by unknown authority
when i was tying to Install the east-west gateway in cluster2 any ideas why or how I can fix that?