User selection dialog always shows up everytime for NAA-SSO in outlook clients using IE.

[glr0221]

URL of sample
Outlook-Add-in-SSO-NAA-IE

Describe the bug
I am unsure if this is a bug or is by design. The select user dialog always shows whenever getTokenWithDialogApi() is called.

To Reproduce
Please run the sample as is and run it on a IE-backed outlook client.

Steps to reproduce the behavior:

1. Install the sample provided in the URL.
2. Open the sample addin in an IE-backed outlook client.
3. The dialog to select a user pops up. Click on the user and allow it to succeed.
4. Close the addin.
5. Open the sample addin again in the same IE-backed outlook client.
6. The dialog to select a user pops up again. Click on the user and allow it to succeed.

Expected behavior
I don't know if this is expected behavior or not. Thank you.

Environment

• Platform [PC desktop, Mac, iOS, Office Online]: PC
• Host [Excel, Word, PowerPoint, etc.]: Outlook
• Office version number: Any IE-backed Outlook client
• Operating System: Windows
• Browser (if using Office Online): NA

Additional context
We wanted to check if this is expected behavior. Is it expected to ask the user to select an account every time the dialog pops up? Thank you.

[AlexJerabek]

Thanks for raising this question @glr0221.

@codexeon, could you please weigh in?