There is an issue with the Win10 app where it doesn't play nice with multiple Internet Protocols. The current solve is to go into your network settings (Control Panel > Network and Internet > Network Connections) and disable Internet Protocol Version 6 (TCP/IPv6) within your network adapter properties menu.
Given length of downloads I have been unable to test yet if (after done downloading) you can re-enable it and still play.
Good luck. Be safe. Wear a mask.