I have been having the same issues with trying to find out what the procedure will be when we arrive in Alexandria. One email from Celebrity said a 72 hour visa will be available upon arrival in Alexandria, when I asked further questions about this someone else from customer services replied saying that the visa needs to be purchased via the visa portal. Not clear at all!
If anyone has applied for a visa, have you used the Alexandria cruise port address as your address in Egypt, have you said it is one entry (although we are there for 2 days), what have you put as the Travelled From Country?
I have emailed customer services at the cruise port but not received a reply as yet.