Only one Facebook & Instagram account can be synced to each Shopify store. It is not possible to sync additional accounts to the same product catalogue. May I ask why you've opened multiple business pages for your business?
If it were possible to add more than one account previously, it would have needed to be through a third-party app such as Flexify, or a product feed app (using a third-party app is speculation and not confirmed as this method would be unsupported by Shopify). What is provided natively within Shopify has not, and does not support adding more than one Facebook account.
You may need to consider consolidating the brands into one social media account, looking into possible third-party app solutions, or creating a second Shopify account.
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