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Outlook 2019 pro plus prompt for password at every start

Richard Castillon




Summary : 

Citrix infra version : 1912 LTSR CU4

VDA version : 1912 LTSR CU3 (same issue with CU4).

Office version : 2019 Pro Plus (seamless mode)

Mailbox type : Office 365 with modern authentication activated in O365 portail


The problem in this case is that each time we open Outlook it will ask for password.

I don't  have the problem if the O365 portail client it's configured in Legacy Authentication.


The only fix that's work is to create a registry entry in order to force the legacy prompt for password.

In this case, the prompt for password will not come anymore.

The registry key is : 






r0x0 (0)


I don't know how until when Microsoft will allow the legacy prompt that's why I dont feel comfortable using this method.


Is anyone else experiencing the issue ?


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