cant sync "what you've listened to" on FB

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I used to be able to sync what ive been listening to on FB,

but it stopped working since sep last year.

I think I deactivated and reactivated my fb account a few time，

I tried relog in to spotify on both my phone and laptop a few times, and i tried disconnnecting fb to spotify.

It shows on my fb that spotify can still post things on my fb. but nothing shows.