VBA Web Form Scraping - Blank field

Hi everyone,

I'm using VBA to populate a web form and 99% of it is working just fine.
I have one problem, though, when trying to populate a field that depends on a previous one. This is an internal (corporate) web form so I can't use a real example, but here is an exercise:

Imagine I want to populate two fields: one being the "Month" and the other being the "day". No matter the data I enter in the Month and although returning no error, the day field is always left blank.
I'm afraid this is somehow related to some kind of validation (as you know, a standard use of the form would't allow me to select February and then have have the day 31st available...). I even tried thing like sending a tabkey between both, just in case, but it still wont work.

Here's the code I'm using (fictional web site address):

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Anyone have an idea about this?
Thank you in advance!

Without seeing the website, it’s nigh on impossible to help. I would take a punt and say you need to trigger the change event of the select element. There are plenty of examples online, but without seeing the html (and probably the accompanying javascript) it’s impossible to be sure