I work on an app which have to accessing keychain items with biometric method( face id or touch id) . We have received an issue that is user installed the app and do registration to insert the data into keychain for later use, then delete and reinstall the app . When user try to do the registration againn, keychain SecItemAdd method failed with error code -25330. The user use iPhone 12(iOS 14.3) and it happen irregularly. The log: 18:35:44.261389+0800 securityd deleted genp,acct=,svce=,agrp=XXXXX,sync=0,musr=, |otherAttr,tomb=0,rowid=78066,cdat=2021-04-29 10:35:44 +0000,mdat=2021-04-29 10:35:44 +0000,sha1=823CD54A2E06C44D941F0C349CBAEC06FBEEC1E2,accc=318183300C0C0470726F740C04616B707530730C0361636C316C30070C026F6501010130090C046F64656C01010130560C026F643150304E0C046362696F314630190C057062696F630410186F86E694AB529847803D3747422E2B30290C057062696F680420467A9C1598FB013ECA1030956B7E73C7CF030994BB45BA21268D111593093233,UUID=F07953A7-55A0-46E0-9052-7B98833B5B03,persistref=,clip=0 from SecDbConnection rw open 18:35:44.263070+0800 securityd insert failed for item genp,acct=bio_account_46323731353237383231,svce=bio_service_46323731353237383231,agrp=XXXXX,sync=0,musr=, |otherAttr,tomb=0,cdat=2021-04-29 10:35:44 +0000,mdat=2021-04-29 10:35:44 +0000,labl=636F6D2E656E74696562616E6B2E6170702E7561742E4175746853444B,pdmn=akpu,sha1=BE484AB751AC112E689819E3D83A2FDD45A73D8E,v_Data=?,accc=3153300C0C0470726F740C04616B707530430C0361636C313C30070C026F6501010130090C046F64656C01010130260C026F643120301E0C046362696F311630090C057062696F63040030090C057062696F680400,UUID=E76CF22A-67CD-4CEC-B522-1C2700C58FB6,persistref=,clip=0 with Error Domain=NSOSStatusErrorDomain Code=-25330 "(null)" UserInfo={-25330=( ( {length = 85, bytes = 0x3153300c 0c047072 6f740c04 616b7075 ... 03706279 6f680410 }, "" ) )} The related code: ViewController objective-c (IBAction)registerAction:(id)sender {       NSString *service = [NSString stringWithFormat:@"bio_service_%@", username];   NSString *account = [NSString stringWithFormat:@"bio_account_%@", username];          BOOL success = [Keychain insertBioAuthDataWithAccount:account service:service generic:nil data:data];   if (success) {     // do something   }       // error handling    } code for insert into keychain objective-c (NSMutableDictionary*) prepareBioAuthDictWithAccount:(NSString *) account service:(NSString*) service generic:(NSString*) generic bioMsg:(NSString*)bioMsg {       CFErrorRef *err = nil;   SecAccessControlRef sacRef = nil;   if (@available(iOS 11.3, *)) {     sacRef = SecAccessControlCreateWithFlags(kCFAllocatorDefault,                          kSecAttrAccessibleWhenPasscodeSetThisDeviceOnly,                          kSecAccessControlBiometryCurrentSet,                          err);   } else {     // Fallback on earlier versions     sacRef = SecAccessControlCreateWithFlags(kCFAllocatorDefault,                          kSecAttrAccessibleWhenPasscodeSetThisDeviceOnly,                          kSecAccessControlTouchIDCurrentSet,                          err);   }       if(err){     return nil;   }       NSMutableDictionary *dict = [[NSMutableDictionary alloc] init];   [dict setObject:(__bridge id)kSecClassGenericPassword forKey:(__bridge id)kSecClass];       if([account isKindOfClass:[NSString class]]){     [dict setObject:account forKey:(__bridge id)kSecAttrAccount];   }   if([service isKindOfClass:[NSString class]]){     [dict setObject:service forKey:(__bridge id)kSecAttrService];   }   if([generic isKindOfClass:[NSString class]]){     [dict setObject:generic forKey:(__bridge id)kSecAttrGeneric];   }       [dict setObject:(__bridge_transfer id)sacRef forKey:(__bridge id)kSecAttrAccessControl];   [dict setObject:bioMsg forKey:(__bridge id)kSecUseOperationPrompt];   [dict setObject:[Keychain queryLabel] forKey:(__bridge id)kSecAttrLabel];   [dict setObject:[Keychain accessGroup] forKey:(__bridge id )kSecAttrAccessGroup];       return dict; } (BOOL) insertBioAuthDataWithAccount:(NSString*)account service:(NSString*) service generic:(NSString*) generic data:(NSData *)data {   NSMutableDictionary * dict = nil;   OSStatus status = 0;       dict =[[self class] prepareBioAuthDictWithAccount:account service:service generic:generic bioMsg:@""];   if(!dict){     return false;   }       [dict setObject:data forKey:(__bridge id)kSecValueData];       SecItemDelete((__bridge CFDictionaryRef)dict);   status = SecItemAdd((__bridge CFDictionaryRef)dict, NULL);   if(errSecSuccess != status) {     NSLog(@"Unable add item with key =%@|%@|%@ error:%d",account, service, generic, (int)status);   }       return (errSecSuccess == status); Has anyone got any ideas why this is happening and how to fix it ? Thanks.