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I have three Google devices That I want to play music in sync with each other using Spotify. For two of the devices that does not appear to be a problem. The Google Hub Max in the living room and the google speaker in the office will easily play music together with no problems. Getting the Google Hub in the bedroom to play music with either of the other devices is proving impossible though. The device shows up in my google home app displaying the information that I've provided below. It itself can play music, but I cannot get it to play music with either of the other two in any configuration. If I start the music on the google app and open the "media" circle at the top and try and start the music on either of the other devices I get an endless loading circle. If I start the music on either of the other devices and try to use the media tab to start it on the bedroom display, I also get an endless loading circle. I've added the bedroom hub into a speaker group, but when I activate the speaker group in any way, the two speakers that already work together start spitting out music, but the one in the bedroom group does not.
I have an almost identical problem, I have two Nest Minis, one Nest Audio, two regular speakers which play through Chromecast, and the problematic unit, a Hub Max. The Hub Max will only play music by itself; it's like it can't cast to the other speakers and vice versa. Any speaker group I add the Hub Max to will not work. I'm not sure what happened, but the problem seemed to coincidentally appear after I changed the security protocol on my wireless network. I've deleted the Hub Max and added it as a new device but the problem continues.
Thanks for sharing details about the issue here. I know how challenging it is when something is not working on your Google Nest Hub Max is not working. I'd love to dig deeper into this. A few questions: how far is your Nest display from the router? What specific settings did you change on your router?
Please make sure that your Nest Hub Max is getting enough signal from your network by placing it within 15-20 feet away from the router. It will also help if you factory reset your Nest display since you change some settings on your router. It will clear all the information and put your device settings to default. Make sure to remove it from your home structure before resetting it. Below are the steps on how to reset it:
Let me know how it goes.