Facebook Instant Game机器人发消息报错#100：原因咨询

Hey, I’ve run into a similar obscure error before with Facebook Instant Games messaging. That unlisted subcode 2018144 isn’t in the public docs, but from my experience it’s almost always tied to either hidden rate limits or user-side session issues—even for registered developers. Here’s what you can try to fix it:

• Watch your send frequency: Even as a verified developer, test messages for Instant Games have unpublicized rate caps. Sending too many in a short window (like 5+ messages in a minute) will trigger this block. Add a simple cooldown (e.g., 2 minutes between test sends) or space out your test batches to see if that resolves it.

• Verify the user’s active session: The "Cannot send at this time" message often pops up if the test user’s game session isn’t active. Ask them to fully close and re-open the Instant Game, then try sending your test message again. If the game is running in the background or the user has logged out of Facebook since launching it, the messaging channel gets blocked.

• Double-check bot permissions: Make sure your linked bot has both pages_messaging and games_instant_play permissions enabled, and that your test user is included in the bot’s allowed audience. Sometimes permissions show as granted in the dashboard, but the test user isn’t in the whitelist for some reason—this can trigger silent blocks.

• Test in production sandbox mode: Facebook’s internal testing environments sometimes enforce stricter limits than production. Try switching to production mode (make sure you only target your test users!) and see if the error goes away. Production’s rate limits for verified developers are usually more lenient.

If none of these work, your best bet is to submit a support ticket through the Facebook Developer Portal. Include the fbtrace_id from your error (DNZhKZlP83D)—the support team can use this trace ID to pull internal logs and tell you exactly why the message was blocked, since this subcode is an internal flag for specific restrictions.

内容的提问来源于stack exchange，提问作者Bemmu