Matter Commissioning Failure - Android App sends empty CountryCode

plastikrab — Wed, 18 Feb 2026 22:51:10 GMT

When commissioning a Matter device via Matterbridge on Android, the Google Home app sends an empty string for the mandatory "countryCode" field. This causes a "Validation-Error 0x87" because the Matter spec requires at least 2 characters. The device then rejects the connection with "ConstraintError 135".

This appears to be a bug in the Google Home Android app's implementation of the setRegulatoryConfig command.

Error logs (simplified):

Cluster: GeneralCommissioning (0x30)
Command: setRegulatoryConfig (0x02)
Error: Validation-Error 0x87
Detail: String "" is too short: 0, min 2 in field countryCode
Status: ConstraintError (135)
Result: Failsafe timer expired / Session ended

Environment:

Controller: Nest Mini
Mobile App: Google Home (Android)
Bridge: Matterbridge / Home Assistant

Re: Matter Commissioning Failure - Android App sends empty CountryCode

arm_dpe — Wed, 04 Mar 2026 20:04:00 GMT

Thanks for reporting this. Could you please open an issue tracker here(matter template) and share the same details above. I will forward it to internal teams for further investigation.

topic Matter Commissioning Failure - Android App sends empty CountryCode in Smart Home Developer Forum

Matter Commissioning Failure - Android App sends empty CountryCode

Re: Matter Commissioning Failure - Android App sends empty CountryCode