diff --git a/src/views/auth-onboarding-view.jsx b/src/views/auth-onboarding-view.jsx
index 10e7cb9e..36ca7a09 100644
--- a/src/views/auth-onboarding-view.jsx
+++ b/src/views/auth-onboarding-view.jsx
@@ -383,7 +383,7 @@ function VerificationButton({phone, scene = 'register', onChallenge, onError}) {
 // no phone-vs-username mode toggle. "Phone takes precedence" (per the spec text) is validation-only:
 // if a phone is filled it must be verified; the invite code is only required for a username-only
 // signup (matching the mock's original submit-time validation, now with real backend calls behind it).
-function Register({errorText, errorLevel, onImRegisterRequest}) {
+function Register({errorText, errorLevel, persist, onImRegisterRequest, onPersistenceChange}) {
   const [form, setForm] = React.useState({username: '', phone: '', code: '', password: '', invite: ''});
   const [challengeId, setChallengeId] = React.useState('');
   const [agreed, setAgreed] = React.useState(false);
@@ -392,6 +392,19 @@ function Register({errorText, errorLevel, onImRegisterRequest}) {
   const change = key => e => setForm({...form, [key]: e.target.value});
   const usingPhone = !!form.phone;
 
+  // Same silent "stay logged in" opt-in Login has (see its own copy of this effect for why there's
+  // no visible checkbox) -- missing here meant every account created by registering (as opposed to
+  // logging in) never had keep-logged-in/auth-token set, so handleLoginSuccessful() never persisted
+  // the session: the very next refresh silently lost myUserId with no redirect to the login page
+  // and no error, just a permanently empty messages-home shell. Every fresh registration hit this on
+  // its first reload.
+  React.useEffect(() => {
+    if (!persist) {
+      onPersistenceChange(true);
+    }
+    // eslint-disable-next-line react-hooks/exhaustive-deps
+  }, []);
+
   // onImRegisterRequest (tinode-web.jsx's handleImRegisterRequest -> a WS connect+createAccountBasic
   // chain) isn't awaited and doesn't return a promise -- on the username/invite-code path (no
   // verifyRegisterCode await ahead of it) `submit` returns and its `finally` clears `submitting`
@@ -795,7 +808,8 @@ export default function AuthOnboardingView({
       errorText={errorText} errorLevel={errorLevel} onLoginRequest={onLoginRequest} onPersistenceChange={onPersistenceChange} onError={onError} />;
     case 'enterprise-register': return <EnterpriseRegister />;
     case 'enterprise-feedback': return <EnterpriseFeedback />;
-    case 'register': return <Register errorText={errorText} errorLevel={errorLevel} onImRegisterRequest={onImRegisterRequest} />;
+    case 'register': return <Register errorText={errorText} errorLevel={errorLevel} persist={persist}
+      onImRegisterRequest={onImRegisterRequest} onPersistenceChange={onPersistenceChange} />;
     case 'reset': return <PasswordReset />;
     case 'identity-check': return <IdentityCheck authenticated={authenticated} hashParams={hashParams} />;
     case 'realname': return <Realname authenticated={authenticated} />;
diff --git a/src/views/tinode-web.jsx b/src/views/tinode-web.jsx
index 3ddab793..1651048f 100644
--- a/src/views/tinode-web.jsx
+++ b/src/views/tinode-web.jsx
@@ -177,7 +177,8 @@ const CTRL_ERROR_TEXT_CN = {
   'authentication required': '请先登录',
   'unknown authentication scheme': '登录方式不受支持，请刷新页面重试',
   'policy violation': '当前操作不符合安全策略要求',
-  'permission denied': '没有权限执行此操作，请重新登录'
+  'permission denied': '没有权限执行此操作，请重新登录',
+  'internal error': '服务器繁忙，请稍后重试'
 };
 function translateCtrlError(err) {
   const raw = err && err.message;
@@ -1517,7 +1518,15 @@ class TinodeWeb extends React.Component {
           this.handleLoginSuccessful(this);
         }
       }).catch(err => {
-        this.handleError(err.message, 'err');
+        // Registration goes over the native WS {acc} protocol, not REST, so im-api.js's
+        // REASON_MESSAGES translation table (REST-only) never sees this error -- it was showing
+        // raw SDK text like "internal error (500)" verbatim (confirmed live: retrying a phone
+        // number that's already registered). CTRL_ERROR_TEXT_CN already translates this same class
+        // of {ctrl} error for login; reused here with a registration-appropriate fallback instead
+        // of loginErrorMessage's own (its 401/403 fallback is "账号或密码错误", which doesn't fit a
+        // failed registration).
+        const known = translateCtrlError(err);
+        this.handleError(known || (err && err.message) || '注册失败，请稍后重试', 'err');
       });
   }