Can't link new Facebook business page to Shopify: What to do?

[herculesshields]

Hi, within Facebook Manager on Shopify I see two other business pages I created on Facebook along time ago but not my new business page I'm hoping to link into my Shopify store.

When I select Create New business manager it says my limit is two. I click use a different ad manager and it just takes me to the same page I'm on displaying my two old FB business pages. I'm trying to set up FB pixel and can't get past this. Maybe I've done something wrong on my Facebook business page? I'm set as Admin on there so looking for help here hopefully.

Thanks!