Unknown error while making a remote service call: Cannot assign requested address

### problem
SendEachForMulticast throws exception and cannot proceed the notification messages.
"Unknown error while making a remote service call: Cannot assign requested address"

Our kubernetes pod handles 6 kafka partition, each partition keeps messages that consist of 500 registration ids. Begore the multicast deprecation, older method works but very slow. We changed the method and started to getting many 'Cannot assign requested address' error.
I do not understand if the library that uses http/2 or not.
does the http client of google library benefits from useinf same connection and does is use reactive event pool like webclient of spring boot?

### environment

* Operating System version: temurin java 17 docker image
* Firebase SDK version: 9.2.0
* framework version: spring boot 3
* Firebase Product: __fcm, messaging___ (auth, database, storage, etc)