This thread is resolved. Here is a description of the problem and solution.
Problem: We you share a translated posts on FB instead the home page is being shared as it is marked as cannonical
Solution: The issue was solved with the last update for Yoast SEO Multilingual 1.2.1.
Relevant Documentation: https://wpml.org/download/yoast-seo-multilingual/?section=changelog
This is the technical support forum for WPML - the multilingual WordPress plugin.
Everyone can read, but only WPML clients can post here. WPML team is replying on the forum 6 days per week, 22 hours per day.