The owners of the content do not want cable subscribers sharing their login credentials with friends and family and gaming the system.
Consequently you will need two factor authentication: 1. Be connected to the modem attached to a video subscription that carries the channel you want 2. Have a valid login for the same video / internet account.
You may have success with the channel’s app instead of Spectrum’s when outside your home.
You can also access the world cup games that are airing on FS1 if you have subscription to the channel using the Fox Sports Go app and the same SpectrumTV login credentials whether you are at home or away from home.