The application domain is not authorized to use PDF Embed API only certain devices

Hello Adobe Community,

I’m encountering a puzzling issue with the Adobe PDF Embed API. My website integrates the API to display PDFs directly on the page, and it has been working fine for most users. However, recently, I’ve started receiving an error on certain devices that states, “The application domain is not authorized to use the PDF Embed API.”

Here’s some background on the situation:

• Implementation: The API is correctly set up with the appropriate client ID, and it functions normally on most devices.
• Issue: On specific devices, the PDF viewer fails to load, showing an error message about the domain not being authorized to use the API.
• What I’ve Tried:
  • Cleared browser cache on the affected devices.
  • Tested the site across multiple browsers and devices, with the issue appearing only in certain environments.
  • Confirmed that my domain is registered in the Adobe Developer Console and should be authorized.
  • Verified that my website is served over HTTPS.

I’m unsure why this problem is occurring only on certain devices. Has anyone else faced this issue, or does anyone have suggestions for resolving it? Any guidance would be greatly appreciated.