After installing and running the Virtual Apps and Desktops Remote PowerShell SDK, explicit authentication is required using the Get-XdAuthentication cmdlet.
After entering the username and password, multi-factor authentication dialog is displayed, but the 6-digit OTP code input items are not displayed.
 

This issue need to collect HAR file for investigation cause, but in order to solve issue you can try the following solution:

Solution:
1. Update Microsoft Edge to the latest version
2. Get the latest Windows update

Note:
・This is related to the compatibility of Edge
・If this is not solving your issue please contact Citrix Technical Support for future investigation

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Problem Cause

The compatibility of Edge