Who are your canary users? This is out of an official Microsoft book:
You should populate your test group with users who are more likely to “offer feedback” if something goes wrong. Just as a canary in a coal mine was used by miners to detect dangerous gas, “canary users” are likely to raise an alarm when a software update causes problems that indicate it shouldn’t be deployed in a production environment. Users who complain are much more valuable as deployment targets for update testing than users who ignore problems and do not provide feedback.