The fix is almost always on the network side: For Bluetooth errors, ensure you are using Secure Simple Pairing (SSP) version 2.1 or higher.
Have you encountered a variant of this error? Check Zebra’s support portal for firmware patches or contact your network security team to audit your cipher suites. invalid encryption method zebra
The IT team had enabled "Protected Management Frames (PMF)" with "WPA2-Enterprise" on their new Aruba access points. Zebra TC52s running Android 8.1 did not support PMF and interpreted it as an unknown encryption method. The fix is almost always on the network