Audio GCCs not seen by Roon

Sorry if I missed this topic, I did a search and only found older threads. My 1.8 sonic transport and optical rendu cannot see my audio Chromecast devices (it sees my video one) and every other dlna program finds them. they are all registered on the same router channel through Google home. would they work if I remove Google home?
I’m not good with networking/router jargon but I read something in earlier posts about subnets etc. They used to work, that’s all I can say. the fact that ALL ARE gone, seems somehow intentional or built in the software. Thanks for your time

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