How do I stop game sharing with someone when I have no switches left

Hi Leeanne, I’m Arturo.
I’ll be happy to assist with your inquiry today.

You can get a possible one more switch by opening the Xbox settings > System > Xbox Assist, choose My Xbox Assist > Search, and then enter My Home Xbox.

If available, the system will give you an extra home switch.
However, if no option appears, unfortunately, it is not possible to get more switches, and it is necessary to wait until the counter resets.

Lastly, it is important to clarify that Microsoft support is not capable of providing more switches, as informed in this related thread:

https://answers.microsoft.com/thread/be81b948-2f7e-4131-ba63-b9008e043a28

Not without changing your Home setting. That's one of the reasons you should only set your own console as your Home.

Hello there!

My name is Jonny and I will be assisting you today!

First, thank you so much for contacting us regarding your inquiry/ concern.

Without access to the Xbox, you won't be able to simply cut it off. You can try changing your password and that should prompt them to log into your account but this is a risk players take when sharing outside of the intended Family setting.

If that doesn't work, you'll need to wait for one of your shares to become available.

My xbox broke. I have to get a new one. I am sharing my home xbox with someone. I do not have any switches left. When I get a new one, will i be able to log in to it? Does this count as a switch?

Yes, no matter what your account is safe within microsoft. You can login and access your account from any XboxOne console as long as your remember your information regarding it.

Hope this helps and enjoy gaming!

Try uninstalling Zune, and reinstalling it, then reset up the share option. Remember to have the 360 switched on when you do. Might not help, but has worked for me in the past when if stopped working.