Welcome to the Community and thanks for reaching out about this.
We suggest that you head over to Settings > Social > Share my listening activity on Spotify and check if that option is toggled on.
Additionally, if your account is linked to Facebook or it's created with your Facebook profile, we recommend heading over to your Account page > Facebook data > and activate the Process my Facebook data option.
If this doesn't do the trick, could you try to log out and log back in?
Keep us posted!
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“Music acts like a magic key, to which the most tightly closed heart opens.”– Maria von Trapp