Hello!
You can find the user-meta stored by TSF here:
https://tsf.fyi/kb/article/108#tsf-user
By default, it’s 'autodescription-user-settings'
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TSF stores the user-meta as an array, so you cannot directly access it: you need to unpack the array first. That array’s index-key you’re looking for is twitter_page
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Two functions that do this for you exist:
the_seo_framework()->get_current_author_option( 'twitter_page' ); // get for current post author
the_seo_framework()->get_author_option( 42, 'twitter_page' ); // Get for author ID 42
I hope this helps 🙂 Cheers!