Maximum number of users assigned to a task

I have a situation where we are assigning individual named users to a task from a database by role but the task isn't visible.  When I look at the process instance, there is no error showing with the task itself except there are no assigned users showing in the assignment tab.  Is there a limit to the number of individual users that can be assigned a task? The users are part of groups in Appian but the task is assigned to individual users instead of the group. 

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