Return SignedOut state after signin in UwpMsalProviderSample sample uwp application

[vikanirav]

Describe the bug

A clear and concise description of what the bug is.

• Is this bug a regression in the toolkit? If so, what toolkit version did you last see it work:

Steps to Reproduce

Steps to reproduce the behavior:

1. Download & Go to 'UwpMsalProviderSample' application and restore nuget packages
2. Change your client id and scopes in app.xaml.cs file
3. Run the application and click Sign In button
4. Sign in window will open & add your credentials [See image 1]
5. Check NewState property value, it will be "SignedOut" [See image 2]

Expected behavior

It should allowed user to sign in successfully after adding credentials in sign in window.

Screenshots

Environment

NuGet Package(s): 
CommunityToolkit.Authentication - v-7.1.1
CommunityToolkit.Authentication.Msal - v-7.1.1
CommunityToolkit.Graph - v-7.1.1
CommunityToolkit.Graph.Uwp - v-7.1.1
Microsoft.NETCore.UniversalWindowsPlatform - v-6.2.12
Package Version(s): 
CommunityToolkit.Authentication - v-7.1.1
CommunityToolkit.Authentication.Msal - v-7.1.1
CommunityToolkit.Graph - v-7.1.1
CommunityToolkit.Graph.Uwp - v-7.1.1
Microsoft.NETCore.UniversalWindowsPlatform - v-6.2.12

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

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

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

Visual Studio 
- [ ] 2017 (version: )
- [ ] 2019 (version: ) 
- [ ] 2019 Preview (version: )
- [Yes] Community 2022 (17.1.5)

[ghost]

Hello vikanirav, 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 🙌