If a project is already created in Clarity, how do I associate the MSP (Microsoft Project) project to the existing project?
While the MSP New Driver doesn't support the use of using Save As to overwrite an existing project like the MSP legacy driver did, the following document provides steps that may help to overwrite an existing project with a local saved MSP Project using the new driver.
Release: All Supported
Component: Clarity Microsoft Project Integration - New Driver
Here's an option that has worked in some cases to workaround the behavior:
If the above doesn't help, the other option would be to save the project back using the legacy driver, then switch back to the new driver going forward. It's recommended to test this out in a non production environment first to measure the impact since there are differences in behavior in the legacy versus new driver.