Good morning. My WMR changed to Tax Reason 151, can you please tell me why and what I can expect from here?

Code 151 typical means the IRS has issued a refund offset.  This means they have received notices of a debt owed and a portion or all the refund will be used to pay the debt.  If the refund is being affected by a refund offset, you will receive a notice from the IRS detailing the offset information.