I got a job offer with new employer and they have filed for H1B transfer (Note: Basis of classification in I129 was selected as 'Change of Employer'). The H1 transfer got approved with effective date as Feb 5th 2018.
I have not joined the new employer yet and I am really debating the decision right now. In the mean time, I hear from the new employer immigration team that I have to join them on 5th Feb 2018 and its illegal for me to work for my current employer. FYI - I have a valid H1B & I94 with my current employer until May 12th 2018. Given this, I have below questions -
Is it mandatory that I need to join new employer on 02/05/2018?
Do I get grace period beyond 02/05/2018? If so, how many days?
Is it not legal to work for my current employer beyond 02/05/2018 even though I have an approved H1B with my current employer with valid I94 until May 2018?
If it is not legal, why is that?