A hospital is deploying a secure wired network using FortiSwitch and FortiAuthenticator. The requirements are to authenticate medical devices using MAC Authentication Bypass (MAB) and doctors' laptops using 802.1X EAP-TLS. Both device types connect to the same switch ports. The network administrator has configured the port security mode to `802.1X-mac-based`. However, only the 802.1X authentications are succeeding; the MAB devices fail to connect. What is a potential cause for this issue on the FortiSwitch port configuration?