I add this extra information in case it works:

I have some "Bluedio F2" brand headphones that do not activate the microphone, 
however, my Philips SHB4000 hearing aids detect them without any problem (the 
input).
Where in Windows and Android the Bluedio & Philips Microphone works for me 
without problems.

Ubuntu 18.10
nasatome at nasatome-pc in ~
$ uname -r
4.18.0-10-generic

nasatome at nasatome-pc in ~
$ bluetoothctl
Agent registered
[Bluedio F]# devices
Device 18:07:21:27:08:11 Bluedio F
Device 00:1E:7C:37:EF:22 Philips SHB4000
[Bluedio F]# info 18:07:21:27:08:11
Device 18:07:21:27:08:11 (public)
        Name: Bluedio F
        Alias: Bluedio F
        Class: 0x00240404
        Icon: audio-card
        Paired: yes
        Trusted: yes
        Blocked: no
        Connected: yes
        LegacyPairing: no
        UUID: Audio Sink                (0000110b-0000-1000-8000-00805f9b34fb)
        UUID: A/V Remote Control Target (0000110c-0000-1000-8000-00805f9b34fb)
        UUID: A/V Remote Control        (0000110e-0000-1000-8000-00805f9b34fb)
        UUID: Handsfree                 (0000111e-0000-1000-8000-00805f9b34fb)
[Bluedio F]# info 00:1E:7C:37:EF:22
Device 00:1E:7C:37:EF:22 (public)
        Name: Philips SHB4000
        Alias: Philips SHB4000
        Class: 0x00240404
        Icon: audio-card
        Paired: yes
        Trusted: yes
        Blocked: no
        Connected: no
        LegacyPairing: no
        UUID: Headset                   (00001108-0000-1000-8000-00805f9b34fb)
        UUID: Audio Sink                (0000110b-0000-1000-8000-00805f9b34fb)
        UUID: A/V Remote Control        (0000110e-0000-1000-8000-00805f9b34fb)
        UUID: Handsfree                 (0000111e-0000-1000-8000-00805f9b34fb)
        UUID: PnP Information           (00001200-0000-1000-8000-00805f9b34fb)
        Modalias: bluetooth:v0039p13A4d0115
        ManufacturerData Key: 0x5349
        ManufacturerData Value:
  53 43                                            SC              
[Bluedio F]# 


https://bugs.launchpad.net/ubuntu/+source/pulseaudio/+bug/1768625

-- 
You received this bug notification because you are a member of Ubuntu
Touch seeded packages, which is subscribed to pulseaudio in Ubuntu.
https://bugs.launchpad.net/bugs/1576559

Title:
  Refused to switch profile to headset_head_unit: Not connected

Status in pulseaudio package in Ubuntu:
  Confirmed

Bug description:
  I'm trying to connect a bluetooth-speaker-with-microphone (Mi
  Bluetooth Speaker) to Ubuntu. It works well as an A2DP sync, but can't
  use it as a headset with microphone.

  The device doesn't list in the "Input Devices" by default, and using
  the sound settings to change the profile of the device to HSP/HFP
  results in this log message:

  W: [pulseaudio] module-bluez5-device.c: Refused to switch profile to
  headset_head_unit: Not connected

  
  I'm running Ubuntu 16.04 LTS. I did an upgrade from Ubuntu 15.10.

  pulseaudio:
    Installed: 1:8.0-0ubuntu3

  bluez:
    Installed: 5.37-0ubuntu5

To manage notifications about this bug go to:
https://bugs.launchpad.net/ubuntu/+source/pulseaudio/+bug/1576559/+subscriptions

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