nRF5340 Audio-DK - Gateway Trying to Connect to Sennheiser Headset - "Could not init connection"

Hi Team,

I recently purchased 2 Audio DK's and I set one up as a gateway and the second as a left headset.  I was able to pair the two, stream audio from my PC through the gateway, and hear the audio on the left headset.  

My next goal was to pair the gateway to a Sennheiser HD 350BT headset.  The gateway sees them and tries to connect but I'm seeing a couple of errors that I can't solve.  The gateway then goes into an infinite loop of scanning, creating a connection, and then failing to initialize the connection until I power off the Sennheiser headset.

Attached is the output from the gateway:

Booting nRF Connect SDK v3.5.99-ncs1-2 ***
GW [00:00:00.257,812] ←[0m<inf> main: myedit: nRF5340 APP core started←[0m
GW [00:00:00.268,981] ←[0m<inf> board_version: ←[0;32mCompatible board/HW version found: 1.0.0←[0m←[0m
GW [00:00:00.293,426] ←[0m<inf> audio_usb: Ready for USB host to send/receive.←[0m
GW [00:00:00.293,457] ←[0m<inf> fw_info: ←[0;32m
         nRF5340 Audio nRF5340 Audio DK cpuapp
         NCS base version: 2.6.2
         Cmake run : Thu Nov 21 14:20:14 2024←[0m←[0m
GW [00:00:00.293,457] ←[0m<inf> fw_info: ------- DEBUG BUILD -------←[0m
GW [00:00:00.293,457] ←[0m<inf> fw_info: ←[0;36mCompiled for GATEWAY device←[0m←[0m
GW [00:00:00.310,150] ←[0m<inf> bt_keys: SC LTK: 0xcea21c2625bdd506a8621495b0396173←[0m
GW [00:00:00.313,018] ←[0m<inf> bt_mgmt_ctlr_cfg: Controller: SoftDevice: Version 5.4 (0x0d), Revision 8591←[0m
GW [00:00:00.313,201] ←[0m<inf> bt_mgmt: Local identity addr: D4:87:41:19:CD:77 (random)←[0m
GW [00:00:00.314,727] ←[0m<inf> main: Scanning for HD 350BT←[0m
GW [00:00:00.317,016] ←[0m<inf> bt_mgmt_scan: Local addr: 7C:6F:70:21:6A:C3 (random). May time out. Updates not printed←[0m
GW [00:00:00.317,016] ←[0m<inf> bt_mgmt_scan: Scanning successfully started←[0m
GW [00:00:00.350,219] ←[0m<inf> bt_mgmt_scan: Creating connection to device: 80:C3:BA:3C:04:F4 (public)←[0m
GW [00:00:00.385,955] ←[0m<inf> bt_mgmt: Connected: 80:C3:BA:3C:04:F4 (public)←[0m
GW [00:00:00.387,359] ←[0m<inf> bt_mgmt_scan: Local addr: 7C:6F:70:21:6A:C3 (random). May time out. Updates not printed←[0m
GW [00:00:00.387,359] ←[0m<inf> bt_mgmt_scan: Scanning successfully started←[0m
GW [00:00:00.387,390] ←[0m<inf> main: Device connected←[0m
GW [00:00:00.627,288] ←[0m<inf> main: Security changed←[0m
GW [00:00:01.147,094] ←[1;33m<wrn> bt_rend_vol: VCS discover finished callback error: -61←[0m
GW [00:00:01.627,227] ←[1;31m<err> bt_bap_unicast_client: Unable to find sink PAC←[0m
GW [00:00:01.627,258] ←[1;33m<wrn> unicast_client: Connection not found←[0m
GW [00:00:01.627,258] ←[1;31m<err> unicast_client: Unknown connection, should not reach here←[0m
GW [00:00:03.228,637] ←[0m<inf> bt_mgmt_scan: Creating connection to device: 80:C3:BA:3C:04:F4 (public)←[0m
GW [00:00:03.228,729] ←[1;33m<wrn> bt_conn: Found valid connection (0x20004a68) with address 80:C3:BA:3C:04:F4 (public) in connected state ←[0m
GW [00:00:03.228,729] ←[1;31m<err> bt_mgmt_scan: Could not init connection←[0m
GW [00:00:03.229,766] ←[0m<inf> bt_mgmt_scan: Local addr: 7C:6F:70:21:6A:C3 (random). May time out. Updates not printed←[0m
GW [00:00:03.229,766] ←[0m<inf> bt_mgmt_scan: Scanning successfully started←[0m
GW [00:00:03.262,542] ←[0m<inf> bt_mgmt_scan: Creating connection to device: 80:C3:BA:3C:04:F4 (public)←[0m
GW [00:00:03.262,664] ←[1;33m<wrn> bt_conn: Found valid connection (0x20004a68) with address 80:C3:BA:3C:04:F4 (public) in connected state ←[0m
GW [00:00:03.262,664] ←[1;31m<err> bt_mgmt_scan: Could not init connection←[0m
GW [00:00:03.263,732] ←[0m<inf> bt_mgmt_scan: Local addr: 7C:6F:70:21:6A:C3 (random). May time out. Updates not printed←[0m
GW [00:00:03.263,763] ←[0m<inf> bt_mgmt_scan: Scanning successfully started←[0m
GW [00:00:03.293,609] ←[0m<inf> bt_mgmt_scan: Creating connection to device: 80:C3:BA:3C:04:F4 (public)←[0m
GW [00:00:03.293,701] ←[1;33m<wrn> bt_conn: Found valid connection (0x20004a68) with address 80:C3:BA:3C:04:F4 (public) in connected state ←[0m
GW [00:00:03.293,731] ←[1;31m<err> bt_mgmt_scan: Could not init connection←[0m

Thanks,

Christopher

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