Punchh has the ability to remove the Apple ID Signup option from the iFrame, as we do control the iFrame configuration. If this is something you would like to pursue for your brand, please reach out to your brand CSM.
Apple dictates eligibility for an app on the Apple App Store to not have Apple ID SSO as a sign in option. If other SSO options are available in the app (Facebook, Google, etc) Apple ID SSO will be a required sign in option. If no other SSO options are available, it's not required.
*If Apple SSO is currently enabled in the mobile app and you would like to disable it, an app update will be required.
If further assistance is required, submit a ticket to Punchh Support. (For help submitting a ticket, click here)