Docker compose deploys dual master and dual slave

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Docker compose deploys dual master and dual slave, with two namesrv. When setting namesrvAddr, I can use the specific ip:port; ip:port, but I cannot send messages normally when using container name:port; container name:port. If there is only one namesrv, I can use the container name:port to set the namesrvAddr address. Is there something wrong with my settings?
This will not allow messages to be sent normally.
NAMESRV_ADDR=namesrv-a:9876;namesrv-b:9877
This will allow you to send messages normally.
NAMESRV_ADDR=ip:9876;ip:9877
But if it is a single machine deployment, this is OK
NAMESRV_ADDR=namesrv-a:9876