Recently we faced several cases which ZOOM client has prompted the window for Proxy Settings requested to key in "User Name" & "Password". As we are SSO for login and shouldn't be required key in any credentials.
We started getting the same message yesterday. If our users sign-in once, the box goes away and does not come back. I opened a ticket with Zoom but received no response. Very disappointing. We are upgrading Zoom to permanently resolve the issue.