Do you mean they don't appear in the audio device list at all, or they
just don't get used even when they're selected from the list? Either
way, bug 1866194 might be the answer and a fix for that should arrive in
20.04 in the coming weeks.

** Package changed: bluez (Ubuntu) => pulseaudio (Ubuntu)

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

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https://bugs.launchpad.net/bugs/1893655

Title:
  Headphones connect but don't appear as audio output

Status in pulseaudio package in Ubuntu:
  Incomplete

Bug description:
  When I switch on my Sony WH-1000XM3 headphones, they reconnect to my
  laptop at Bluetooth level, but don't appear as an audio device. I have
  to remove them in the Ubuntu Bluetooth settings, and then re-pair
  them, every time. This is rather inconvenient. This started happening
  after upgrading to Ubuntu 20.04.

  ProblemType: Bug
  DistroRelease: Ubuntu 20.04
  Package: bluez 5.53-0ubuntu3
  ProcVersionSignature: Ubuntu 5.6.0-1021.21-oem 5.6.19
  Uname: Linux 5.6.0-1021-oem x86_64
  ApportVersion: 2.20.11-0ubuntu27.8
  Architecture: amd64
  CasperMD5CheckResult: skip
  CurrentDesktop: Unity:Unity7:ubuntu
  Date: Mon Aug 31 14:48:53 2020
  InstallationDate: Installed on 2020-07-14 (48 days ago)
  InstallationMedia: Ubuntu 20.04 LTS "Focal Fossa" - Release amd64 (20200423)
  InterestingModules: rfcomm bnep btusb bluetooth
  MachineType: LENOVO 20U9CTO1WW
  ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-5.6.0-1021-oem 
root=UUID=42d20f5a-04dd-4073-ac83-e07bd283a1d1 ro quiet splash vt.handoff=7
  SourcePackage: bluez
  UpgradeStatus: No upgrade log present (probably fresh install)
  dmi.bios.date: 07/01/2020
  dmi.bios.vendor: LENOVO
  dmi.bios.version: N2WET19W (1.09 )
  dmi.board.asset.tag: Not Available
  dmi.board.name: 20U9CTO1WW
  dmi.board.vendor: LENOVO
  dmi.board.version: SDK0R32862 WIN
  dmi.chassis.asset.tag: No Asset Information
  dmi.chassis.type: 10
  dmi.chassis.vendor: LENOVO
  dmi.chassis.version: None
  dmi.modalias: 
dmi:bvnLENOVO:bvrN2WET19W(1.09):bd07/01/2020:svnLENOVO:pn20U9CTO1WW:pvrThinkPadX1CarbonGen8:rvnLENOVO:rn20U9CTO1WW:rvrSDK0R32862WIN:cvnLENOVO:ct10:cvrNone:
  dmi.product.family: ThinkPad X1 Carbon Gen 8
  dmi.product.name: 20U9CTO1WW
  dmi.product.sku: LENOVO_MT_20U9_BU_Think_FM_ThinkPad X1 Carbon Gen 8
  dmi.product.version: ThinkPad X1 Carbon Gen 8
  dmi.sys.vendor: LENOVO
  hciconfig:
   hci0:        Type: Primary  Bus: USB
        BD Address: F8:AC:65:6D:04:AB  ACL MTU: 1021:4  SCO MTU: 96:6
        UP RUNNING 
        RX bytes:1274806 acl:246 sco:0 events:180845 errors:0
        TX bytes:152114364 acl:177469 sco:0 commands:3182 errors:0

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