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Problem
A two-factor authentication code fails to arrive via SMS, email, or app during login.
Symptoms
No SMS or email code received after multiple attempts.
Delay of several minutes before a code arrives.
Previous codes worked normally.
Possible Causes
Carrier or SMS delivery delay.
Incorrect phone number or email on file.
Mobile signal issues.
Email code caught in spam filter.
Authentication service outage.
Resolution
Step 1
Wait a few minutes, as SMS delivery can be delayed.
Step 2
Check spam or junk folders if using email-based codes.
Step 3
Verify the phone number or email on file is correct.
Step 4
Request a new code rather than waiting indefinitely for the first one.
Step 5
Try an alternate verification method if available (backup codes, authenticator app).
Step 6
Contact support if codes consistently fail to arrive.
Prevention
Keep contact information up to date.
Set up an authenticator app as a backup method.
Save backup/recovery codes in a secure location.
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