Fix Meta Ads Manager Setup

I have a Shopify store that should be feeding products, pixel data and conversions straight into Meta’s new Ads Manager, yet every time I try to complete the connection I’m met with vague “API error” messages. So far I’ve connected the ecommerce platform, tried deleting and rebuilding the entire ad account, scoured Meta’s documentation, and even asked their AI agent, but the account is now stuck in limbo—Meta won’t let me delete it and start fresh.

What I need is hands-on guidance that gets me from this broken state to a fully functioning Facebook ads setup. The ideal flow is:
• audit the current Business Manager, Commerce Manager, pixel and catalog configuration
• resolve whatever authentication or permission issues are blocking the API calls
• reconnect Shopify so the product catalog syncs and server-side events (Conversions API) fire correctly
• verify everything by launching a small test campaign and confirming purchase events in Events Manager and Ads Manager.

I’m happy to jump on a live screen-share, or follow detailed written instructions—whatever works best to get this solved quickly. Once everything is operational, please leave me with a concise step-by-step recap so I can maintain the setup without running in circles again.