Supabase Auth errorSupabase Auth: sms_send_failed

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Why the SMS doesn’t send, and the fix

1. 01

   The provider credentials or sender are wrong

   “Sending an SMS message failed. Check your SMS provider configuration.” Supabase docs, Auth error codes (sms_send_failed)

   A typo in the account SID, auth token or messaging service, or a sender number the account doesn’t own, makes every send fail. Re-enter them in the Phone provider settings under Authentication in the dashboard.

2. 02

   The number isn’t in international format

   Send the number with a plus sign and country code, the way the docs example does. A local number without the country code can be refused by the provider.

   const { error } = await supabase.auth.signInWithOtp({
     phone: '+13334445555',
   });

3. 03

   The provider account can’t send there

   Trial accounts, unverified numbers and blocked countries are common reasons. The provider’s message log shows which one. Upgrade the account, verify the destination for trials, or allow the country in the provider’s settings.

4. 04

   Tests burn real SMS

   “To test phone sign-in without sending SMS, add test phone numbers with fixed codes.” Supabase docs, Phone login

   Also check: repeated tests against real numbers hit provider limits and cost money. Add test phone numbers with fixed codes for development.

Checked against the vendor’s docs on November 9, 2026: Supabase docs: Auth error codes; Supabase docs: Phone login.

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