Microphone on earbuds doesn't work?

I recently got a pair of Skullcandy Ink'd earbuds, and I'm using them for my Google Pixel 3a XL. The mic only seems to work when I go to the camera and select external microphone. The microphone does not work (audio is recorded through the phone's mic) on apps like Snapchat and Instagram. It also doesn't work for Google Assistant. I have not yet tried them with a phone call. The button for controls works perfectly.

I've previously used Samsung AKG wired earbuds with a mic with my pixel, and the mic on those worked perfectly for everything, but I broke those, that's why I'm using the Skullcandy ones.

I don't know if it's a problem with my earbuds or if it's a problem with my phone. If anyone could help, that'd be amazing :)