关于Facebook Messenger平台fr_BE locale枚举解析失败的技术问询

Hey Bruno,

Let me walk you through this issue based on my experience with Facebook's developer tools:

• Why isn't fr_BE on the supported locales list?
  Facebook's locale support for the Messenger platform is typically tied to their internal localization roadmap. It’s not usually a bug when a specific regional variant is missing—more often, it’s a product prioritization call. For example, nl_BE might have been added earlier due to higher user demand or earlier localization efforts in that region, while fr_BE is either still in the pipeline or hasn’t met the threshold for official support yet.

• Quick checks to rule out simple issues
  Wait, I noticed your error mentions the value fr_be (lowercase "be")—the standard ISO locale format uses uppercase for the region code (fr_BE). Even though it’s not listed in the docs, it’s worth testing the properly formatted version first to make sure the error isn’t just a case sensitivity issue.

• What if it’s still not working?
  If the correctly formatted fr_BE still throws an error, you can submit a bug report through Facebook’s developer support channels. Be sure to include your use case and why fr_BE is critical for your implementation—this helps the team evaluate whether it’s an oversight that needs fixing.

• Temporary workaround
  For now, you can use the generic French locale fr_FR as a stand-in. While it’s not region-specific to Belgium, it will still work for French-speaking users in Belgium and won’t break your Messenger profile setup.

内容的提问来源于stack exchange，提问作者Bruno Marques