A sales rep at Ursa Major Solar was assigned to a role under their manager...

Allow Forecasting is what the administrator should review to solve this issue. Allow Forecasting is a user permission that enables users to access and edit forecasts. If a user does not have this permission, they will not be able to see their own forecast or any forecasts below them in the role hierarchy. Therefore, the administrator should make sure that the sales rep has this permission enabled on their profile or permission set.