On Thursday, January 26th, 2023, I received an offer letter with a start date for a new company. On Friday, January 27th, I put in my two-week notice at my current employment. Today, January 29th, I received an email from the company that hired me, saying they have decided to move on to another candidate. Can they do that? Why would they? Am I allowed to find out why? So now I don't have a job. My current employer has let me go since I put in my notice.