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This is a policy that is created by your work organization. At some point, you may have signed in to your device using your work credentials. You can go to Settings > Accounts > and make sure you are signed in with your personal Microsoft Account.
Then go to Settings > Accounts > Access work or school > you will be able to see your work account listed there. Click on the account and click disconnect to remove your work profile from your device.
Please note this may disconnect all Microsoft resources such as office 365 if you are using a work provided MS office 365.