In 2019 I had to pay tax on some RSU money that I hadn't received. This year the RSU was granted and it seems I'm being taxed on the whole amt again?

In 2019 despite the fact that the RSU hadn't vested I was forced to pay tax on a portion of it because of my age (56) it was considered somewhat under my control.  That always seemed wrong, but whatever.  
This year that money did indeed vest, but it seems like the whole amount is being taxed.  How do I account for the fact that some portion of this was already taxed in 2019 filings?  It is showing as income on my W2.