Hi @nz_steven,
I can confirm that this is something that has to be done by our internal Shopify developers directly on a per store level, ensuring the Headless App has the correct scope on the specific store the app is installed on.
This is something that we do need you to reach out via the Shopify Help Center to get done since we do need you to fully authenticate with the store in question.
To get this resolved as quickly as possible, I’d like to ask you to reach out via the Shopify Help Center once again, while logged into the store this is occurring on. If there’s any confusion regarding the issue with the advisor you are chatting with, please do let them know you were discussing this with the Developer Support Team in the Community Forums, and provide them with a link to this thread, and if they need help with getting it escalated to the correct team they should reach out to the Developer Support Team internally for more assistance.