Below are the most common reasons why WhatsApp rejects, blocks or does not allow a username.

1. Choosing a username that is too short (<3 characters)

Minimum is 3 characters.

2. Using special characters or emojis

WhatsApp blocks:
. - _ / \
and all emojis.

Example:

• @mert-dev (blocked)

• @ahmet (blocked)

3. Using trademarked brand names

WhatsApp immediately blocks anything with:
Meta, Google, Amazon, Apple, Microsoft, Tesla, etc.

4. Using scam-like keywords

“support”, “help”, “official”, “customer”, “verify”, etc.

5. Using country names with short suffixes

“usaonline”, “turkeyteam”, “uklive”
Often globally restricted.

6. Trying too many usernames too quickly

Triggers spam protection → 24h lock.

7. Creating usernames while using a VPN

Region mismatch → error.

8. Using outdated Android/iOS versions

Rollout is slower on old devices.

9. Trying to register usernames on a new account too soon

New numbers are monitored more strictly.

10. Choosing overly generic or spammy words

“free”, “sale”, “money”, “win”, “shop”, “xxx”, “sex”, etc.

Ideal username format

✔ Letters + numbers
✔ 5–15 characters
✔ No emojis
✔ No trademarks
✔ No suspicious words