If there is a contract, training or study in the system that your Supervisor should have access to, and it was not given to him when creating the document, you can change it.
Step 1
From the side menu select the appropriate section (Contracts, Health examinations or OSH Trainings), and then click the three dots button located on the right side of the document. From here, press Edit.
Step 2
Make sure that notifications are enabled, and tick the option next to the For Supervisor section. Save and close the changes.