Works great with latest WP, but older versions (all below 5.0) will cause fatal errors and/or internal server errors because of the use of determine_locale() in meta-tag-manager/classes/open-graph.php which was first introduced in WP 5.0.
Succesfully tested: 5.8, 5.7, 5.4
Failed for: 4.9.18
Supported WordPress Version should be changed in the plugin details tab.
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