Passing the customer Id and secrete throgh iframe rendnered in Account Concierge app

On the account concierge page, I am showing the Shopify page which includes the Iframe where I am passing the customer ID and secrete as URL parameter.

but I am unable to get the customer ID and secrete within the Account Concierge App page.

but I can get the customer ID and secrete if I render the same page in another tab outside the Account concierge app