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Deloitte Office Transfer – Accepted Entry level job offer

I would like some info or advise on Deloitte's office transfer.

I accepted an offer in Deloitte Advisory in NYC and don't start until mid-summer. I am finishing my undergrad degree this May. I now realize I want to live in California. They haven't yet assigned me to a specific client and will in about a month or two. 

Is it okay to ask them now to start my job at a California office?

What's the possibility they will likely allow me to change offices?

Is there anything bad that can happen from asking them about it?

Should I reach out to my HR contact or the recruiter?

I am new and have no family in the corporate world, so I'm looking help in navigating this decision. Thanks in advance all!