Microsoft 365 Office Auth. failure in Parallels HMTL5

Discussion in 'Parallels Remote Application Server – HTML5 Gateway' started by AntonioL6, Jan 29, 2026.

  1. AntonioL6

    AntonioL6 Bit poster

    Messages:
    2
    Hello,
    we have an issue with Microsoft 365 Office authentication that occurs only in Parallels HTML5.

    Environment
    • Parallels RAS
    • Windows Server RDS
    • Microsoft 365 / Outlook (64-bit)
    • Authentication via VMware Workspace ONE (certificate-based)
    Behavior
    - Parallels Client: Office sign-in works
    - RDS desktop: Office sign-in works
    - Parallels HTML5: Office sign-in fails

    In HTML5, Outlook immediately fails with:
    Something went wrong. [4nsw]
    Error Code: 2147746132

    upload_2026-1-29_13-50-16.png


    The Workspace ONE authentication window never appears in HTML5.
    In Parallels Client/Desktop, the normal flow works (email → Workspace ONE auth → success).

    We also noticed that this process gets triggered during Office login:
    Microsoft.AAD.BrokerPlugin.exe -ServerName:App.AppXgvz9wxd0frjs1prg5kvtcz083996jyv.mca

    Question
    Is this a known limitation of Parallels HTML5 with certificate / broker-based authentication (Workspace ONE, WAM)?
    Is there a supported workaround, or is this unsupported by design?

    Thanks in advance.
     

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