Symptoms
You configure the BizTalk MQSC Adapter Queue Manager settings. When you enter two or more queue manager names, only the first name is used. Any additional name is ignored.
Resolution
This issue is fixed in Cumulative Update 2 for Host Integration Server 2016.
Status
Microsoft has confirmed that this is a problem in the Microsoft products that are listed in the "Applies to" section.
References
Learn about the terminology Microsoft uses to describe software updates.