Proxy Prompt at logon ? (stores credentials plaintext)

**Describe the bug**
Azure Batch Explorer Logon behavior is very different from Storage explorer. We run bot Batch and Storage explorer on a VDI/WVD host pool to connect to private endpoint batch and storage accounts respectively.

ADFS sign-on with Storage Explorer always works flawlessly in line with our conditional access policies.

Batch explorer sign-on will randomly stop working until we clear out AppData folders, at which point, Batch Explorer throws up a 'Proxy' Dialog:


This dialog does not mention a proxy but accepts my Azure AD credentials, after which normal MFA sign-on can proceed.

Can someone please explain what this is?

**To Reproduce**
Steps to reproduce the behavior:
1. Clear Any Batch Explorer cach from C:\Users\\AppData\Romaing
2. Logon will present 'Proxy Dialog'
3. Dialog accepts AD uname and pwd
4. Normal Azure AD sign-on can only complete after completing proxy dialog, even though we do not work with a proxy

**Expected behavior**
Normal Azure AD sign-on with MFA as with torage Explorer, we do not use a proxy.

**Version (please complete the following information):**
- OS: Windows (WVD host)
- Version 2.17.0 Stable (and all versions preceding it)