Your workplace did give you a 'commercial work phone', as you put it. Likely because it has Samsung Knox on it, allowing them to manage work apps and data without interfering with your personal apps and data, should they choose.
Samsung Knox predates Android Enterprise, which offers some of the same functionality to corporate customers on handsets from many vendors. However, Huawei aren't included in the Google Enterprise program. Funny that.
Don't log into Facebook. Go to Setting, Apps, disable it. All you'll have lost is 100MB of storage space and a minute of your time. I appreciate preloaded apps are offensive on principal, but are insignificant compared to other factors.