This issue may occur if a menu profile is assigned in the cp_onboardingmenuprofile parameter in Admin Settings. The menu profile specified by this parameter (e.g. COREPORTAL_EMPLOYEE) is automatically added to an employee's account once their onboarding is complete. If onboarding is incomplete, the system will not add this menu profile to the employee, the system will not add the menu profile to the employee, or it may add and then remove it.
To resolve this, follow the steps below.
From the dashboard menu, select the Administrator Dashboard.
On the Site Manager widget, next to Admin Settings, click OPEN.
In Keyword Search, enter cp_onboardingmenuprofile, then click the search icon.
Next to the parameter, click EDIT.
Delete the existing value, then click OK.