A personally owned key depends on its owner's access. It is revoked when that person loses the required team access or their account is removed or banned. Adding the person back does not reactivate the revoked key.
Have an authorized member inspect the key's status and replace it when needed. A service-owned key uses its own named integration identity and survives changes to the person who created it; it still has limited permissions and can be revoked. Verify the replacement in your application before retiring another working key. Send support a key reference or error, never the complete credential.