Zoom Phone Feature Not Showing Up On Zoom Workplace Pro Plus Owner Account

Hi, I purchased a Zoom Workplace Pro Plus account. I have assigned myself (the account owner) a user phone number, extension, and Zoom Workplace Pro Plus package, but when I log into my web app or desktop app, there is no Zoom Phone option. Instead, I get the message: "To use the Phone in Zoom Web App, contact your admin." I contacted Zoom support and they told me to enable "Zoom Phone on PWA", which I did but which didn't make any difference. 

I assigned a number to a single user (also using a Zoom Workplace Pro Plus account), and she has no problem accessing the Zoom phone feature.

Any suggestions?

Thank you!

Conor