Before 2023
========
Email based discovery can be used to add a Store to the Workspace, using the email address instead of the Store URL. We could do this for on-prem Stores, even with Gateway. The steps are provided here.

https://www.citrix.com/blogs/2013/04/01/configuring-email-based-account-discovery-for-citrix-receiver/#

However, this doesn't work for Cloud Customers where Workspace Service act as Storefront in Citrix Cloud and there is no Gateway. If we just point the SRV record (_citrixreceiver._tcp.domain) to the Cloud Store URL (domain.cloud.com), Workspace fails to add the store with a certificate error. We get the certificate error because Workspace tries to validate the email domain against the Store URL and they are different domains.


After 2023
=======
https://docs.citrix.com/en-us/citrix-workspace/global-app-config-service/configure-gacs-cloud.html#setup-email-based-discovery

Instructions

Before 2023
========

• Go to https://adsui.cloud.com/, and add the domain for which we want email based discovery to be enabled
• Once the Domain is verified, we can add a Workspace URL for the domain, as shown below 
• Add the same Store URL used for Cloud Store in this format - https://domain.cloud.com:443/citrix/store, as shown below.

Now when a User enters the email address to add a Store, Workspace sends a query to discovery.cem.cloud.us and Cloud returns the Store URL for the verified email domain. There is no need for SRV records anymore, like we needed for on-prem. This is a new service

After 2023
=======

https://docs.citrix.com/en-us/citrix-workspace/global-app-config-service/configure-gacs-cloud.html#setup-email-based-discovery


Note: This feature is supported on Workspace 2106 and later, which uses the Global App Config Service.
https://developer.cloud.com/citrixworkspace/server-integration/global-app-configuration-service/docs/overview