The screenshot in comment #1 seems to show the headset is in A2DP mode.
This means, per the original Bluetooth specification, it can only output
and not input.

To enable input (microphone), you need to change the profile from A2DP
to HSP/HFP. Although that makes the output quality low (bug 1838151),
it's the only option that supports microphones at the moment.

Please change the profile for the headset to HSP/HFP and then retest the
microphone.

** Changed in: bluez (Ubuntu)
       Status: Confirmed => Incomplete

** Changed in: pulseaudio (Ubuntu)
       Status: New => Incomplete

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https://bugs.launchpad.net/bugs/1872641

Title:
  Microphone doesn't work with Sony WH-CH700N bluetooth headphone

Status in bluez package in Ubuntu:
  Incomplete
Status in pulseaudio package in Ubuntu:
  Incomplete

Bug description:
  I can choose the headphone as an input device, but it doesn't work.

  ProblemType: Bug
  DistroRelease: Ubuntu 20.04
  Package: bluez 5.53-0ubuntu3
  ProcVersionSignature: Ubuntu 5.4.0-21.25-generic 5.4.27
  Uname: Linux 5.4.0-21-generic x86_64
  NonfreeKernelModules: nvidia_modeset nvidia
  ApportVersion: 2.20.11-0ubuntu26
  Architecture: amd64
  CasperMD5CheckResult: skip
  CurrentDesktop: ubuntu:GNOME
  Date: Tue Apr 14 08:41:32 2020
  InstallationDate: Installed on 2020-02-26 (47 days ago)
  InstallationMedia: Ubuntu 20.04 LTS "Focal Fossa" - Alpha amd64 (20200225.4)
  InterestingModules: rfcomm bnep btusb bluetooth
  MachineType: To be filled by O.E.M. To be filled by O.E.M.
  ProcEnviron:
   TERM=screen-256color
   PATH=(custom, no user)
   XDG_RUNTIME_DIR=<set>
   LANG=hu_HU.UTF-8
   SHELL=/usr/bin/zsh
  ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-5.4.0-21-generic 
root=UUID=1dc32c86-d135-46fa-a68a-1cd7fcf4f31e ro quiet splash vt.handoff=7
  SourcePackage: bluez
  UpgradeStatus: No upgrade log present (probably fresh install)
  dmi.bios.date: 06/26/2015
  dmi.bios.vendor: American Megatrends Inc.
  dmi.bios.version: 2603
  dmi.board.asset.tag: To be filled by O.E.M.
  dmi.board.name: M5A97 R2.0
  dmi.board.vendor: ASUSTeK COMPUTER INC.
  dmi.board.version: Rev 1.xx
  dmi.chassis.asset.tag: To Be Filled By O.E.M.
  dmi.chassis.type: 3
  dmi.chassis.vendor: To Be Filled By O.E.M.
  dmi.chassis.version: To Be Filled By O.E.M.
  dmi.modalias: 
dmi:bvnAmericanMegatrendsInc.:bvr2603:bd06/26/2015:svnTobefilledbyO.E.M.:pnTobefilledbyO.E.M.:pvrTobefilledbyO.E.M.:rvnASUSTeKCOMPUTERINC.:rnM5A97R2.0:rvrRev1.xx:cvnToBeFilledByO.E.M.:ct3:cvrToBeFilledByO.E.M.:
  dmi.product.family: To be filled by O.E.M.
  dmi.product.name: To be filled by O.E.M.
  dmi.product.sku: SKU
  dmi.product.version: To be filled by O.E.M.
  dmi.sys.vendor: To be filled by O.E.M.
  hciconfig:
   hci0:        Type: Primary  Bus: USB
        BD Address: 00:15:83:32:FA:A8  ACL MTU: 510:8  SCO MTU: 48:10
        UP RUNNING 
        RX bytes:156081 acl:67 sco:2629 events:2771 errors:0
        TX bytes:1351383 acl:2903 sco:2625 commands:88 errors:0
  rfkill:
   0: hci0: Bluetooth
        Soft blocked: no
        Hard blocked: no

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