Depends on the group. If the group is a close-knit group of friends, then it may cause some concern, but they'd probably eventually get over it. The problems might simply be an issue of trust ("You didn't tell us!") to outright hatred ("VKs are a blight upon metahumanity!"). A more mercenary team could get through it fairly easily. The technomancer helps them make money, and so s/he might be worth the risk. Have a guy like Clockwork in your group, though, and it could fall apart.
I've been playing a technomancer for years now, and she's never admitted to any of her teammates that she's a VK. The shaman knows something's weird with her aura, and her fixer boyfriend actually knows. But the team itself doesn't. They're about to find out, if only because I can't justify buying a deck to keep up the illusion. I have been wanting to do this reveal for a while now, though. Should be fun.