Fix "Access Denied" Bug

Description

• Resolves the bug with some lecturers/professors not being able to access the manage page.
• LabraCore MR: labracore!195 (merged)
• LabraDoor MR: labradoor!73 (merged)

Related Issues

• Resolves #143 (closed)

Checklist

• I have added a changelog entry to reflect the significant changes I made.