Cannot Access Locally Hosted Website via Alternate Device

I setup a local server using Express, which I’m able to access through the same device which is hosting it. The problem occurs when I try using an alternate device to connect to the same server,

I tried using my phone to connect to the server but there isn’t any kind of response on either side.

For example, I’m hosting on 192.168.1.19 port 3000 (PC), so when I enter 192.168.1.19:3000 on my phone it’s as if it can’t even find the server. The weird thing is, a couple months back when I did this exact thing it used to work.