Recovery key set by my "company, school, or institution" on private laptop

I want to enable FileVault encryption but in the dialog I encounter this message:

A recovery key has been set by your company, school, or institution.

I don't have my laptop set up by a company, school or institution because this is my private laptop.

This dialog may be related to some profile-files I have recently installed for university in order to get the VPN to work. How can I reset this so that I can use my own recovery key?

I am using macOS 10.13.

This Apple discussion says:

After a couple of exchanges with our engineering team they have recommended two things you may try.

The first solution is as follows:

• Disable FileVault
• In the system directory, go to /Library/Keychains
• Move the files FileVaultMaster.keychain and FileVaultMaster.cer to the Trash. Deleting the files should then allow you to enable FileVault on the system and provide a recovery key. Refer to article http://support.apple.com/kb/HT5077 if you have questions regarding the location of the files.

Second solution:

Performing an erase and reinstall of the computer system will reset the master password and allow you to encrypt the drive again.

The message disappeared after moving the files /Library/Keychains/FileVaultMaster.cer and /Library/Keychains/FileVaultMaster.keychain to a different directory.