Microsoft Surface Ergonomic Keyboard does not pair in Ubuntu 18.04

I am trying to pair the Microsoft 3RA-00022 Surface Ergonomic Keyboard in Ubuntu 18.04. By GUI Ubuntu interface it simply says: "Failed to add device"

By cmdl, I do this: *# bluetoothctl

pair EE:EE:EE:EE:EE:EE (mac real replaced)

Attempting to pair with ED:24:4C:21:D0:4F

Failed to pair: org.bluez.Error.AuthenticationFailed*

Can you give me a hand? I have almost 2 weeks searching online with no luck. Greetings,

Microsoft Surface Ergonomic Keyboard does not pair in Ubuntu 18.04

pair EE:EE:EE:EE:EE:EE (mac real replaced)

Attempting to pair with ED:24:4C:21:D0:4F

Failed to pair: org.bluez.Error.AuthenticationFailed*

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pair EE:EE:EE:EE:EE:EE (mac real replaced)

Attempting to pair with ED:24:4C:21:D0:4F

Failed to pair: org.bluez.Error.AuthenticationFailed*