H1b Transfer from one company to another company in US

Hi Saurab,

I files my H1b petion from company AA in USA and

I work for company BB in India

My petition got approved,visa got stamped from AA company

Now AA don’t have a job for me,they don’t even run my pay rol alos.

Now company BB is ready to transfer my h1b and run payrol.

Can i transfer immidiately once i land their or is it going to be any problem??

Please help me wiht this