So...
the basecoach calls for time, was granted time and when the coach started his conference the umpire called illegal conference and ended the conference..
There always seems to be a scratching for details and a vague scenario presented by you coach Joe, one that is difficult to decipher and understand..
its confusing.
So.. I guess that said.. I'll just affirm the umpire, based on your scenario, was wrong and should have allowed the conference that he had granted time out for.
Hope that helps.