Has anyone got Apple Pay working with Embedded forms?

Hi. Bit of a cry for help. We have been trying to offer Apple Pay on the standard donation forms using Merchant Services but cannot get it to work and was wondering if anyone else, in the UK if that makes a difference, has got it set up and the process they went through.

We have gone through all the instructions on the knowledge base, the apple merchant file is in place and can be accessed but none of the forms we use show the Apple Pay option when tested on an Apple device on safari with Apple Pay set up. We have tested this with people inside and outside our organisation. We can see Apply Pay when we use either the QR code or the direct form URL given by RE but not when we use the embed code.

Unfortunately in this case support have been of little help saying its working for them despite many people testing it multiple times who cannot. I have even set up a vanilla website with just a page with the embed code to check it wasn't anything to do with our Wordpress set up. Nope same results, no Apple Pay. Any advice would be really appreciated.

Thanks