Bluetooth HFP profile not working - Headset Microphone missing, Microsoft Bluetooth A2DP Source not in Device Manager

Question

I am unable to use the microphone of my Sennheiser Momentum M2 OEBT headphones on my HP B8SQ8EA#AB8 with Intel Wireless Bluetooth (Intel Core 7 150U).

System info:

• OS: Windows 11 Pro 25H2 (Build 26200.8246)
• Bluetooth adapter: Intel(R) Wireless Bluetooth(R) — driver version 24.30.1.1 (latest)
• Headphones: Sennheiser Momentum M2 OEBT

Problem: The headphones connect in A2DP mode (stereo audio works) but HFP never establishes. In Sound Settings only "Headphones - MOMENTUM M2 OEBT" appears — no separate "Headset Microphone" entry. Microphone input produces only static noise.

Key finding: Microsoft Bluetooth A2DP Source is completely missing from Device Manager. No HFP-related Bluetooth entries exist at all.

Troubleshooting done:

• SCOEnabled = 1 confirmed in registry
• Bluetooth services restarted
• Full headphone reset and clean re-pair multiple times
• All hidden Bluetooth devices removed and re-paired
• DISM + SFC completed with no errors
• Windows 11 in-place repair performed — issue persists
• Intel Bluetooth driver fully up to date (24.30.1.1)

Evidence: Same headphones work perfectly including microphone on another PC with Realtek Bluetooth (HP B8SQ8EA). Issue is specific to Intel Bluetooth — Microsoft Bluetooth A2DP Source missing suggests a Windows Bluetooth audio component is broken or not installed.

Is there a way to restore the missing Microsoft Bluetooth A2DP Source component without a clean Windows install?I am unable to use the microphone of my Sennheiser Momentum M2 OEBT headphones on my HP B8SQ8EA#AB8 with Intel Wireless Bluetooth (Intel Core 7 150U).

System info:

• OS: Windows 11 Pro 25H2 (Build 26200.8246)
• Bluetooth adapter: Intel(R) Wireless Bluetooth(R) — driver version 24.30.1.1 (latest)
• Headphones: Sennheiser Momentum M2 OEBT

Problem: The headphones connect in A2DP mode (stereo audio works) but HFP never establishes. In Sound Settings only "Headphones - MOMENTUM M2 OEBT" appears — no separate "Headset Microphone" entry. Microphone input produces only static noise.

Key finding: Microsoft Bluetooth A2DP Source is completely missing from Device Manager. No HFP-related Bluetooth entries exist at all.

Troubleshooting done:

• SCOEnabled = 1 confirmed in registry
• Bluetooth services restarted
• Full headphone reset and clean re-pair multiple times
• All hidden Bluetooth devices removed and re-paired
• DISM + SFC completed with no errors
• Windows 11 in-place repair performed — issue persists
• Intel Bluetooth driver fully up to date (24.30.1.1)

Evidence: Same headphones work perfectly including microphone on another PC with Realtek Bluetooth (ASUS Vivobook 15 X1504VA-NJ1500). Issue is specific to Intel Bluetooth — Microsoft Bluetooth A2DP Source missing suggests a Windows Bluetooth audio component is broken or not installed.

Is there a way to restore the missing Microsoft Bluetooth A2DP Source component without a clean Windows install?