48 don't support eSIMs at the moment.
If you didn't receive your SIM in the post then either try ordering again or contact 48 support about the first order.
To contact 48 see the link in my signature below or email them at firstname.lastname@example.org
If you're ordering again then make sure that the Irish postal address and eircode are 100% correct.
I don't think that you can port your number to 48 until you have a physical SIM and have activated it.