Don't know what exactly triggers this, but happens more often than not.
TF203034: The administrator has set a limit of 64 inputs for this operation. Verify the parameters of your operation and try again
Parameter name: targetItems
I work in a fairly large company and don't have access to the TFS settings. Is there any workaround for this maybe ?
Screenshot:
https://i.imgur.com/fz6caaM.png