Shopify Customer Extension Window is Undefined – Seeking Alternatives

I’m encountering a problem with the Shopify customer extension. In my current implementation, the customer extension window is returning as undefined. I’ve verified the code and double-checked the documentation for any missed configuration steps, but the issue persists.

Has anyone experienced a similar problem? Are there alternative methods or workarounds that you’ve found effective in accessing or handling the customer extension window? Any insights or suggestions would be greatly appreciated.

Thanks in advance for your help!