Can't get the proxy to work

I want to capture requests from my Andriod device. Found out through these posts that Postman can do that

Unfortunately, I’m not having any success. When I set up the proxy using the steps in the posts, I get a message on the device saying the connection timed out. There’s no internet connection. I’ve also used an iPhone, set up the proxy using the ip and port of the macbook that has Postman running.

Can you help me find out what I’m doing wrong? Should I set something up on the Macbook, besides the steps mentioned in the articles?

The network I’m connecting to is a company guest network that has a password. Maybe they’re blocking something on this network? I will try at home tonight on my private network, see if it works there.