Server Validation Failed: The URL does not appear to belong to a valid server

We have a user with a valid license and publisher access to Posit Connect. However, when they try to publish an app from the Workbench, they receive the following error:

The URL "https://connect.posit.companyname.org/" does not appear to belong to a valid server. Please double check the URL, and contact your administrator if the problem persists.

We guided the user to add the Connect account via:
Tools → Global Options → Publishing → Publishing Accounts → Connect → Posit Connect,
but entering the URL results in the same error.

This issue is affecting only this specific user.

What could be causing this?

Make sure they've updated to the latest version of the rsconnect package, then restart the session and try again.

install.packages("rsconnect")

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