Spoke with customer service and they wanted to refer me to Alcatel. The basics is that T-Mobile and the Alcatel Linkzone device do not look like they will work. If you are exploring this as an option for Nintendo on the go, look to another provider.
Well that is a bummer! The mobile hotspots we sell are not necessarily intended to be used for online gaming as the configuration options they offer are pretty limited. The primary function of a mobile hotspot is to provide the user with internet access for activities such as browsing the web and streaming media content. As a gamer myself, I totally feel your pain. While I do not own a Switch, I have run into similar issues with console gaming on a hotspot.