Our app tried to operate a Matter bulb in a local Wi-Fi. At first，the iOS app generate the rootCertificate : let rootKeypairs = FCSMTRKeys() rootCertificate = try MTRCertificates.createRootCertificate(rootKeypairs, issuerID: __tmpIssuerID, fabricID: NSNumber(value: __tmpFabricId)) Then commissioning the bulb and generate the Operational Certificate like this: let opKeypairs = FCSMTRKeys() guard let rootCer = rootCertificate else { return false } let operationalPublicKey = FCSMTRKeys.getSecPublicKey(opKeypairs.publicKeyData) let nocCertificate = try MTRCertificates.createOperationalCertificate( rootKeypairs, signingCertificate: rootCer, operationalPublicKey:operationalPublicKey.takeUnretainedValue(), fabricID: NSNumber(value: __tmpFabricId), nodeID: NSNumber(value: deviceId), caseAuthenticatedTags: nil) factoryParams = MTRDeviceControllerStartupParams( ipk: rootKeypairs.ipk, operationalKeypair: opKeypairs, operationalCertificate: nocCertificate, intermediateCertificate: nil, rootCertificate: rootCer) At last commissioning complete，we can use iOS App operate the Matter bulb. We have a problem：the Root Certificate、Operational Certificate and the keypairs we shared to the Android side. The Android App can’t operate the Matter bulb. We don't know why.