⚡ TL;DR (for the impatient)

Lock your Facebook profile.
Force close the app.
Reopen.

Yes, seriously. That’s the switch.

🧠 The Deeper Explanation (for people who want to know why)

After testing across multiple accounts, devices, and groups — and comparing cases where people in the SAME group had the option while others didn’t — this doesn’t behave like a normal UI feature rollout.

It behaves like a privacy-state-gated feature.

Anonymous commenting appears to be unlocked only when your account meets certain internal “risk / privacy” conditions.

Locking your profile changes several backend flags at once:

• Limits public visibility of your identity
• Reduces data exposure to non-friends
• Signals high privacy preference
• Lowers harassment / retaliation risk scores
• Aligns with the purpose of anonymous posting

In other words: Facebook is more willing to let you speak anonymously when your real profile is already shielded.

🔬 Why Other “Fixes” Don’t Work

Most suggestions online target the wrong layer:

App-level fixes:

• Reinstalling
• Clearing cache
• Updating
• Switching phone / desktop

These only matter if the feature is already enabled for your account.

If the permission flag isn’t there, no amount of reinstalling will summon it.

⚙️ Conditions That Still Apply

Even with the profile locked, anonymous commenting will only show when:

• The group allows anonymous activity
• The specific post supports anonymous replies
• You’re using the mobile app (desktop support is inconsistent)
• The feature has rolled out to that group type

Admins cannot manually enable this per user.

🧪 Extra Steps If It Doesn’t Appear Immediately

Try in this order:

1. Lock profile
2. Force stop Facebook
3. Reopen app
4. Check a post where others are already commenting anonymously
5. Tap your profile icon next to the comment field

Optional:

• Log out → log back in
• Wait a few minutes for settings to propagate

❗ Weird Behaviors This Also Explains

People reporting things like:

• Spouse can do it, I can’t (same phone)
• Works in some groups but not others
• Option randomly appears/disappears
• Can post anonymously but not comment
• No history of bans but still missing feature

All consistent with account-level privacy gating + gradual rollout.

🧭 Bottom Line

This isn’t about violations, admin settings, or device type.

It’s about whether Facebook considers your identity sufficiently shielded to allow anonymous participation.

Locking your profile flips that state.

If this fixed it for you, confirm — this issue has been floating around for years with zero clear answers.