SyncUser.authenticate(with: Credential.usernamePassword(username: username, password: password, actions: [.useExistingAccount]), server: Constants.syncAuthURL) { (user, error) in }

libc++abi.dylib: terminating with uncaught exception of type realm::keychain::KeychainAccessException: Keychain returned unexpected status code: -34018

_dispatch_once(dispatch_once_t *predicate,
    DISPATCH_NOESCAPE dispatch_block_t block){
if (DISPATCH_EXPECT(*predicate, ~0l) != ~0l) {
    dispatch_once(predicate, block);
} else {
    dispatch_compiler_barrier();
}
DISPATCH_COMPILER_CAN_ASSUME(*predicate == ~0l);}