Can't get SD+ to associate technicians to groups

Can't get SD+ to associate technicians to groups

1> My organization has technicians in all States in the country and a HQ of which I have made them all sites.
2> Most Technicians are associated to all the sites and some to a few sites
3> Sites all have default settings on SLA, business rules, support groups

Now my deli ma
1> I used the settings in the attached file, default on holidays, operational hours, Support Groups, Business rules and SLA but custom on Departments and Technicians/site associations
2> I can see all the sites for the technicians
3> When I try to create more support groups under default settings, I can't see any technicians in the box to select from except administrator (default), We have default support group for all technicians regardless of the site (i.e all sites have the same support group)

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