If the device authorisation access restriction is active and an employee attempts to sign in on an unauthorised device, they will see the following message: "Sign-in failed, because your device has not been authorised by the account administrator. Please contact the account administrator.", along with the request authorisation for this device link.
However, if the link does not appear, it means that another type of access restriction has been enabled, apart from device authorisation or that two types of restrictions are active at the same time.
To be able to access your account, contact the administrator.