I am trying to pre select the taxonomy in a form based on the users role.
Taxonomy is Section
Terms are: Fire Department, Live & Work, Office. Recreation
User roles are: Fire Department Manager, Live and Work Manager, Office Manager, Recreation Manager
So essentially I want to pre select the section with the matching department user role
Based on your situation this can be quite complex;. You want to select the values based on the user's role.
While i'm not able to write the code for you as this is out of our support forum scope. However what you will need to do is to have a point on the page where you will the user's role displayed, then from there you use Javascript to pick up the role that is displayed.
Using an If statement in the Javascript you can then switch to the different code that is being used to select the various values of the fields.
This is one way to look at it.
The other way is to completely remove these fields from your form and use php in our CRED hook to set the values when the user submits the form. This is probably the easier approach.