The vendor has published 2 unique mention(s) for this bug: 1. Adding machines to an existing device collection using the Citrix Virtual Apps and Desktops Setup wizard in Provisioning Services and adding machines to existing machine catalogs to the Delivery Controller™ might fail when the device collection has more than 250 devices. 2. Adding machines to an existing device collection using the Citrix Virtual Apps and Desktops™ Setup wizard in Provisioning Services and adding machines to existing machine catalogs to the Delivery Controller might fail when the device collection has more than 250 devices. Latest urls for this bug: 1. https://docs.citrix.com/us/en/provisioning/1912-ltsr/whats-new/cumulative-update-6/fixed-issues.html