Need to display the account panel when offline.

[Richasy]

Describe the bug

We are using WindowsProvider to help the application with Graph authorization. But in the offline state (no network connection), the account panel does not display.

Steps to Reproduce

Steps to reproduce the behavior:

1. Cut off the network connection
2. Try to use LoginButton or other controls to call WindowsProvider.SignInAsync
3. Observing behavior

Expected behavior

Display the account panel, and the account panel provides information that requires a network connection.

Screenshots

If applicable, add screenshots to help explain your problem.

Environment

Windows 10 Build Number:
- [ ] Fall Creators Update (16299)
- [ ] April 2018 Update (17134)
- [ ] October 2018 Update (17763)
- [ ] May 2019 Update (18362)
- [x] Insider Build (build number: 22000)

App min and target version:
- [ ] Fall Creators Update (16299)
- [ ] April 2018 Update (17134)
- [ ] October 2018 Update (17763)
- [ ] May 2019 Update (18362)
- [x] Insider Build (22000)

Device form factor:
- [x] Desktop
- [ ] Xbox
- [ ] Surface Hub
- [ ] IoT

Visual Studio 
- [ ] 2017 (version: )
- [x] 2019 (version: ) 
- [ ] 2019 Preview (version: )

Hello Richasy, thank you for opening an issue with us!

I have automatically added a "needs triage" label to help get things started. Our team will analyze and investigate the issue, and escalate it to the relevant team if possible. Other community members may also look into the issue and provide feedback 🙌