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Reported for: WooCommerce Multilingual & Multicurrency 5.1.3
Overview of the issue
When using WPML with Facebook for WooCommerce, the translated products synced to Facebook display an incorrect currency. This is due to Facebook for WooCommerce taking the currency from WooCommerce settings and not from WPML’s multi-currency settings.
Workaround
Unfortunately, this is a known limitation. In order to list products in multiple currencies on Facebook, it’s necessary to create multiple feeds by country/language, which Facebook for WooCommerce plugin doesn’t currently support.