Unexpected Supabase Auth Session Logout After 2–3 Seconds (email and OAuth)

I’m seeing a new issue in my React + Vite app where Supabase auth (email/password and OAuth) signs users in successfully but then automatically signs them out 2–3 seconds later—no error is shown.

Steps to Reproduce

1. User signs in (email/password or OAuth).
2. Supabase returns a valid session and access token.
3. After ~2–3 seconds, an

SIGNED_OUT

SIGNED_OUT

event fires and the session is cleared.

Expected
Users stay signed in until they explicitly sign out or the JWT expires.

Actual
The session is removed almost immediately after login.

---

Environment

*

@supabase/supabase-js

@supabase/supabase-js

 ^2.49.4
*

vite

vite

 ^5.4.1
* React + Vite
* Node.js (current LTS)
* Browsers: Chrome / Firefox / Edge

Auth Client Initialization

export const supabase = createClient<Database>(
  import.meta.env.VITE_SUPABASE_URL,
  import.meta.env.VITE_SUPABASE_ANON_KEY,
  {
    auth: {
      autoRefreshToken: true,
      persistSession: true,
      detectSessionInUrl: true,
    },
  }
);

export const supabase = createClient<Database>(
  import.meta.env.VITE_SUPABASE_URL,
  import.meta.env.VITE_SUPABASE_ANON_KEY,
  {
    auth: {
      autoRefreshToken: true,
      persistSession: true,
      detectSessionInUrl: true,
    },
  }
);

Key Hooks

useEffect(() => {
  // handle SIGNED_IN, TOKEN_REFRESHED, SIGNED_OUT, INITIAL_SESSION events
  const { data: { subscription }} = supabase.auth.onAuthStateChange(
    (event, sessionData) => { … }
  );
  // initial session fetch
  const { data: { session: initialSession }} = await supabase.auth.getSession();
  // setSession, setUser, setInitialized…
}, [queryClient, isFirstTimeUser, handleWelcomeEmail]);

useEffect(() => {
  // handle SIGNED_IN, TOKEN_REFRESHED, SIGNED_OUT, INITIAL_SESSION events
  const { data: { subscription }} = supabase.auth.onAuthStateChange(
    (event, sessionData) => { … }
  );
  // initial session fetch
  const { data: { session: initialSession }} = await supabase.auth.getSession();
  // setSession, setUser, setInitialized…
}, [queryClient, isFirstTimeUser, handleWelcomeEmail]);

---

What I’ve Tried

* Confirmed

persistSession: true

persistSession: true

.
* No errors in console/network.
* Env vars look correct.
* No stray sign-out logic elsewhere.

Questions

1. Are there known issues or config tweaks that could force immediate sign-outs?
2. Could cookie, CORS or SameSite policies be wiping the session?
3. Any extra logging or debug flags in

@supabase/supabase-js

@supabase/supabase-js

to trace why

SIGNED_OUT

SIGNED_OUT

is triggered?

Any pointers or debugging tips appreciated—thanks!

Unexpected Supabase Auth Session Logout After 2–3 Seconds (email and OAuth)

SIGNED_OUT

SIGNED_OUT

@supabase/supabase-js

@supabase/supabase-js

 ^2.49.4
*

vite

vite

 ^5.4.1
* React + Vite
* Node.js (current LTS)
* Browsers: Chrome / Firefox / Edge

Auth Client Initialization

export const supabase = createClient<Database>(
  import.meta.env.VITE_SUPABASE_URL,
  import.meta.env.VITE_SUPABASE_ANON_KEY,
  {
    auth: {
      autoRefreshToken: true,
      persistSession: true,
      detectSessionInUrl: true,
    },
  }
);

export const supabase = createClient<Database>(
  import.meta.env.VITE_SUPABASE_URL,
  import.meta.env.VITE_SUPABASE_ANON_KEY,
  {
    auth: {
      autoRefreshToken: true,
      persistSession: true,
      detectSessionInUrl: true,
    },
  }
);

Key Hooks

useEffect(() => {
  // handle SIGNED_IN, TOKEN_REFRESHED, SIGNED_OUT, INITIAL_SESSION events
  const { data: { subscription }} = supabase.auth.onAuthStateChange(
    (event, sessionData) => { … }
  );
  // initial session fetch
  const { data: { session: initialSession }} = await supabase.auth.getSession();
  // setSession, setUser, setInitialized…
}, [queryClient, isFirstTimeUser, handleWelcomeEmail]);

useEffect(() => {
  // handle SIGNED_IN, TOKEN_REFRESHED, SIGNED_OUT, INITIAL_SESSION events
  const { data: { subscription }} = supabase.auth.onAuthStateChange(
    (event, sessionData) => { … }
  );
  // initial session fetch
  const { data: { session: initialSession }} = await supabase.auth.getSession();
  // setSession, setUser, setInitialized…
}, [queryClient, isFirstTimeUser, handleWelcomeEmail]);

---

What I’ve Tried

* Confirmed

persistSession: true

persistSession: true

@supabase/supabase-js

@supabase/supabase-js

to trace why

SIGNED_OUT

SIGNED_OUT

is triggered?

Any pointers or debugging tips appreciated—thanks!

Unexpected Supabase Auth Session Logout After 2–3 Seconds (email and OAuth)

Unexpected Supabase Auth Session Logout After 2–3 Seconds (email and OAuth)

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