It depends. When you run a Streamlit app on a machine in your intranet, there are a two different cases to consider:
If all you want is to allow other users from your company to access the app when they’re not inside the company (say, they’re at a café), when all they need to do is log into the company’s VPN.
If what you want is for anyone in the world to be able to access the app, then that’s probably a question for your intranet’s system administrators. They usually block this kind of access on purpose, and unblocking is done on a case-by-base basis.