Facebook accounts can no longer be linked or edited through the API
The routes and tools that linked a Facebook account to an avatar or edited a Facebook profile are gone. Facebook accounts you already have keep their history.
Removed, each now a 404: POST /devices/facebook/avatar-projects/{avatarProjectId}/link-account, GET /devices/facebook/link-account-status and PATCH /devices/facebook/accounts/{username}/profile.
Changed: POST /devices/accounts/profile-edits with platform facebook and update_account_profile on a Facebook account answer unsupported_platform. link_social_account with platform facebook answers facebook_addon_required. facebook_seats on POST /devices/accounts/seat-checkout and purchase_account_seats answers a 400 unless the seat options' facebook_addon_offer is with_new_accounts. share_to_facebook on a scheduled post's read says what the post will do as of now, which can change until it posts.
What to change: stop calling the removed routes and sending platform facebook to these tools, and leave out facebook_seats. A Facebook profile takes its name from the Instagram account it is linked to, so edit that one.
