Issue with dynamic group assignments - User name becomes malformed

Hello Community,

I'm having intermittent issues with assigning groups of users to a Task using the procedure: https://community.k2.com/t5/K2-Five/Dynamic-Workflow-Task/td-p/101770

I'm using SQL and the user's FQN to assign a group of users to a task.  The issue is with some users it combines the user name twice and ends up assigning it to a bogus username (I.E. ends up looking like K2:domainfqndomainfqn) 

The only difference I see in users that get double names is they have a middle name in their display name.  I thought that might be the issue, however, we're essentially passing the FQN into the UMUser service so we can get the details on the user identity.

Thanks,
David