Roam SL missing from AirPlay

Hi, I need help with a persistent AirPlay issue that now only affects my Roam SL.

What works:

1. Era 300 appears in AirPlay after router reboot.
2. HomePod Mini works normally.
3. Roam SL is reachable on LAN by IP.
4. Roam SL responds on Sonos API port 1400.

What does not work:

1. Roam SL does not appear as an AirPlay target.
2. Roam SL does not appear in RAOP browse either.
3. Factory reset + firmware update did not fix it.

Network and device context:

1. OpenWrt router, subnet 192.168.5.0/24.
2. Era 300 at 192.168.5.226, Roam SL at 192.168.5.172.
3. Mac is on same subnet, direct reachability is good.
4. Router reboot restored Era behavior but not Roam.

Diagnostics already performed:

1. dns-sd browse:

• Era/HomePod show in _airplay._tcp and _raop._tcp.
• Roam missing repeatedly.

2. Roam direct checks:

• ping OK.
• HTTP on 1400 OK.
• AirPlay service endpoint on 7000 responds.

3. Sonos API checks:

• DeviceProperties schema contains AirPlayEnabled.
• /status/airplay returns 200.
• /reboot endpoint returns forbidden on current firmware.

4. Comparison result:

• Era and Roam both reachable and same firmware family.
• Only Era advertises discoverable AirPlay/RAOP records.

What I need from community:

1. Any known Roam SL-specific bug where AirPlay service is alive but mDNS advertisement is absent.
2. Any hidden Sonos app toggle/state that forces re-registration of Roam AirPlay.
3. Any confirmed support workflow beyond reboot, router reboot, firmware update, and factory reset.

If useful, I can share full command outputs for:

1. _airplay._tcp browse
2. _raop._tcp browse
3. direct lookup attempts
4. SOAP/DeviceProperties responses