After migrating from on-prem to Citrix Cloud, user is unable to launch a session to their VDA.
VDA shows event viewer error: Event id 1050: Citrix connection validation failed on domain "for user" for reason 'hashexchangefailed'

To resolve this issue, you will need to run some commands on your cloud account.

To do this, you will need to download the PowerShell Posh SDK
Download the Posh SDK here - https://www.citrix.com/downloads/citrix-cloud/product-software/xenapp-and-xendesktop-service.html 

Run command:  Get-XdAuthentication
(this will prompt you to login to your cloud account so you can run commands from your cloud enviroment)

Get-BrokerDesktopGroup 
(Check if this returns  MachineLogOnType as LocalMappedAccount)

If it does, can you change this to Active Directory instead. 

To do this, please run command: 

Set-BrokerDesktopGroup -MachineLogOnType ActiveDirectory

Once set, restart the VDA and try again and test launching the VDA. 
You should see that you are now able to launch the VDA without issues. 

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Problem Cause

Issue related to ticketing.
In Create Delivery Group > Users, you can check a box for "Allow users not in Active Directory to use this delivery group". Checking this box will set the logon type to LocalMappedAccount.

The combination of LocalMappedAccount configured as logon type and the launch request coming through a Cloud Connector results in using two different tickets - one is sent to the VDA in the PrepareSession request, the other one is sent to the endpoint to present to the VDA. As a result, validation fails because of ticket mismatch.

After migrating from on-prem to Citrix Cloud, user is unable to launch a session to their VDA. VDA shows event viewer error: Event id 1050: Citrix connection validation failed on domain "for user" for reason 'hashexchangefailed'