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Many routers do not allow devices on guest network to interact with usual wifi networks for security by default. In fact it is recommended to use all your smart devices on a guest network because it increases security of your home network by not allowing smart devices to interact with your home network. Reason for this is, smart devices usually have obsolete firmware updates & many security vulnerabilities because their manufacturers don't give much attention to this aspect(there have been many cases of smart devices being turned to botnet). All my smart bulbs & switches are on guest network after initial configuration done on guest network with "allow interaction with home network" option enabled & later disabled as usual.