That is a very good question and there could be a variety of reasons why they are telling you this. I will share one very possible answer.
The producers of a show select their choices for their pilots but ultimately the network needs to approve the actors. When the network takes the time to audition the actors, they want to have a few choices to choose from. For this reason, the producers may be certain they have found the right actor for the role but you will hear the casting is still going on. They are just looking for more choices to bring in front of the network so they can ultimately make their selection.
Lorena
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We were told to arrive 20 to 30 minutes before our call time and we did. What time should we have put on the voucher? Our call time, the time we arrived at the parking lot, or the time that we reached the AD and were given the paperwork? (We didn’t know, so we left it blank.)