Just replying here because removing user assignments via bulk assignments does not remove them from the people section of a project, so they will still receive notifications and projects will show up in "projects I'm on"

Update: removing the user from the task and reassigning to the user allowed them access, however, this is obviously not feasible for all tasks.

We have a Fusion scenario that converts requests to projects based on status. Once these requests are converted, we're having issues with users who are either primary contacts on the request and project, or users who are directly assigned tasks not being able to access the project or task. For examp...