Field and Form Rule - Set Group

Field and Form Rule - Set Group

Wondering whether there may be an issue in the Field and Form Rules when setting a group based on field change.
I'm able to assign a specific technician based on a value set on a drop down box, however when I attempt to 'Set Field' for Group, I get no drop down or validation for group names.
Manually entering the group name does not work either, and the group remains as it was set on the form designer.
Any other field is able to be set using this method except for Group.

I've also tried to use 'execute script' to setText of group to the group name, but this fails also.

We're running version 9414 currently.

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