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@nandatripathi
I think I know the fix – are you able to go into wp-content/plugins/fb-instant-articles/vendor/facebook/facebook-instant-articles-sdk-php/src/Facebook/InstantArticles/Transformer/Transformer.php and amend line 248 from:
if (function_exists('mb_convert_encoding')) {
to
if (false && function_exists('mb_convert_encoding')) {
@nandatripathi I’ve made a different update and tagged as 5.0.1 – that should work too.