Is there a way to have a team text message number that the team can use to send and receive messages?

You can create a new extension and assign a phone number to that extension. Then you can implement a server app which uses password flow authentication. The app will be responsible for sending and receiving SMS messages. Now, you can implement your login methods to allow those 5 employees to use that SMS app. Think about putting your fax machine in a room and give access to those employees who can use the fax machine.

Did you figure this out? I'm looking for a similar feature.

I have the same question and the answer above seems very confusing. Can anyone help?

Are you a developer? What part is confusing and can you make your own questions?