Learning Initiative or course assignment expiration rule update

Summary:

How can we update the default renewal settings for a course that has already been assigned to users through a Learning Initiative?

Example:
Course A was originally configured with a 1-year renewal period and assigned to a group of users. We now need to change the renewal period to 2 years.

A. How can we ensure that this revised renewal rule is applied to users who were assigned the course before the change was made?

B. Additionally, what factors could prevent the new 2-year renewal period from taking effect for existing users who were assigned the course under the previous renewal configuration?