Hank here from Shopify.
Are you wanting to change your store currency to the dirham? Or is it specifically related to your PayPal account?
If wanting to change your store currency let me know and I can assist you with this. However, if it is just with your PayPal account, this guide from their website shows how to change the currency within your PayPal account. But you can also reach out to PayPal if you need further assistance.
But you are correct, PayPal express is available as a payment gateway within the United Arab Emirates.
Let me know if you have any additional questions!
Thank you for clarifying.
Sadly as the issue is with their payment integration, I would not be able to assist with this. However, that link I shared earlier has their support channels, but you may be able to contact them via social media pages also.
They may also be experiencing a backlog and this may be why they have not replied yet. I hope that you get this issue resolved with them soon.