Use half‑width numbers only. Include leading zero if OTP starts with 0.

If the "Submit" button isn't working, try an Incognito/Private window.

Half-Width vs. Full-Width: A Tale of Two Characters | MailMate

These are standard Western-style numbers. They are narrow and take up half the space of a Kanji character. Example: 1 2 3 💡 The Fix

However, users frequently encounter a frustrating roadblock: a specific, technical-sounding error message or instruction. You might be staring at a login screen that reads: