How to link form contol dropdown box to formula cell

Hi To All

Warm Greetings !!

I have an excel that has dropdown column from form control, in F4 there is a formula of vlookup that take the range from A2 to B20 in consideration but the reference cell that is given to vlookup formula to pick corresponding value is E4 which is also the reference cell of dropdown box and therefore its not showing any name rather than a value, problem with the formula is that when we select any name from dropdown it does not respond to any value in F4 despite changing values in E4.

I am using these setting for the first time so maybe I am making some mistake kindly help me in this & also mention the mistake I was making in it.

For the convienience of readers' image & excel file is attached

PFA
drop down.png

Thanks In advance !!

Best Regards