I can’t use the app if I don’t join the current account linked to the network I’m trying to connect to.

Why is my app forcing me to connect to an existing email address on the network when I want to set up a different system in my room so no one can control my music (unless they have the password to my email address of course). 

For context, my mum has 5 speakers around the house. I’d like my own speaker to act separately to hers. Every time I reset the app, because I’m connected to the same wifi, it forces me to join my mums account. How can I do my own thing, with my own speaker, but on the same network? 

Any help would be hugely appreciated as currently my speaker has been in a cupboard for 8 months as I’m failing every time I give it shot.