How do I watch a show on Disney+ with friends in other countries?
The show must be accessible in both your own and your friends' countries on Disney+.
Pro tip:
If you're having a hard time finding a show to watch together, you can usually be safe with Disney+ originals. In general the TV show needs to be mutually available in both of your regional Disney+ libraries to set up a global Disney+ party.
You can also consider subscribing to a VPN such as
Nord VPN. By VPN-ing into your friend's region, you can access the same Disney+ titles & watch any show together.