After migrating from on premise to Citrix Cloud, users facing issues when launching apps via DaaS only via native CWA. Launching via web browser works as expected.

Users are getting error: Transaction ID: xxxxxxxxxxxxxxxxx ( The resource is not available at the moment. Please try again later).

Issue is seen for all users and on different Citrix Workspace App versions.
 

You will need to make sure "TrustRequestsSentToTheXmlServicePort" is set to true in your site. 

To check this, run command: Get-BrokerSite

If this is set to False, you will need to run command: Set-BrokerSite -TrustRequestsSentToTheXmlServicePort $true

Note: In order to run this command in Citrix Cloud, you will need to download the Citrix DaaS Remote PowerShell See - https://docs.citrix.com/en-us/citrix-daas/sdk-api.html

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Problem Cause

TrustRequestsSentToTheXmlServicePort was set to False.

After migrating from on premise to Citrix Cloud, users facing issues when launching apps via DaaS only via native CWA. Launching via web browser works as expected. Users are getting error: Transaction ID: xxxxxxxxxxxxxxxxx ( The resource is not available at the moment. Please try again later). Issue is seen for all users and on different Citrix Workspace App versions.

https://docs.citrix.com/en-us/citrix-daas/secure.html#xml-trust