I got Plus Plan and tried a bunch of plus servers according to this.
However, I keep getting Error Code 83 every time I tried to stream any movies from Disney Plus. Tested with another VPN and it works fine.
Anything I am missing here?
I predominantly use a vpn router for my streaming needs and have no issues with Disney+. FWIW, I seem to get the best performance currently from ProtonVPN’s GA servers. YMMV.
Disney+ is supported on Plus servers located in Germany, India, Australia, UK, France, Canada, Japan, and the US. If you were connected to Plus servers in one of these countries and still face issues, please send us a ticket with relevant details: https://protonvpn.com/support-form
I have no issues with Disney plus when using a plus server. Make sure you’re using ProtonVPN’s DNS servers.
From where do you Stream? I had the same Problem, even with using plus server. But i found out Netflix work. So the point maybe, if you stream via Android based SMART device, delete the Disney Data and Disney cache in the Apps Settings. This helped me. I guess those Data n Caches safe the IPs. Maybe i helped someone out there 
Thanks for reaching out, mate!
The issues happen when I try streaming via windows browsers (Firefox, Brave)
Tried differently with Disney Plus iOS app and it works perfectly. Weird! Guess, I gotta stick to iOS apps.