Trying to log into Spotify on an iPhone 12 & iPhone 13 (two separate users) using username and password. Authentication fails. After experimenting, I realize it worked fine when I was using my cellula

If I buy a TP-Link Deco X90, would I be able to reduce the WiFi transmit power? I have a 2400 sq ft. space and I don't want it to be powerful enough that my neighbors can access it. Or for that size s