Hi Anthony, Thanks for starting this thread! Let me cover some important points that may help with this issue:
During the migration the assignments that existed on Classic Layout Templates were also migrated, so that the Workfront administrators don't have to redo the assignments for NWE.
When managing Layout Templates in NWE your assignments apply to NWE only, so that the when users opt-in to NWE they're seeing the Layout Template you've assigned them in NWE. Same is true for Classic as well, so that if you are in Classic you're assigning the people a Layout Template for their Classic experience. I know there might be some confusion as of now, since the names of Layout Templates are mostly similar in NWE and Classic due to migration, but you can see that when you are in Classic and assigning people to a Layout Template you're only seeing your Classic Layout Templates.
As a "pro tip" to make this easier to track and manage, I'd recommend adding the following 2 columns to your view on "Users" page:
Classic Layout Templates displayname=Actual Classic Layout Template textmode=true valueexpression=IF(ISBLANK({layoutTemplateID}),IF(ISBLANK({role}.{layoutTemplateID}),IF(ISBLANK({homeTeam}.{layoutTemplateID}),IF(ISBLANK({homeGroup}.{layoutTemplateID}),"No Layout Template",{homeGroup}.{layoutTemplate}.{name}),{homeTeam}.{layoutTemplate}.{name}),{role}.{layoutTemplate}.{name}),{layoutTemplate}.{name}) valueformat= New Workfront Experience Layout Templates displayname=Actual NWE Layout Template textmode=true valueexpression=IF(ISBLANK({uiTemplateID}),IF(ISBLANK({role}.{uiTemplateID}),IF(ISBLANK({homeTeam}.{uiTemplateID}),IF(ISBLANK({homeGroup}.{uiTemplateID}),"No Layout Template",{homeGroup}.{uiTemplate}.{name}),{homeTeam}.{uiTemplate}.{name}),{role}.{uiTemplate}.{name}),{uiTemplate}.{name}) valueformat= These will show the actual Layout Template assignments (considering the assignments hierarchy) that users have both in Classic and NWE. I hope this helps! Thanks, Gevorg Gevorg Kazaryan Product Manager