This is the entire process for me to preorder a physical+digital book:

1. Find out there's new book to preorder. Click on the "preorder now" link on D&D Beyond.
2. Put the book in the cart.
3. Be told that I need to go on another website to order from EU.
4. Go to that website.
5. Connect with Wizards authentification because God knows why I was disconnected from the last time, despite the hostname being dndstore.wizards.com.
6. Put the book in the cart.
7. Validate my address once more, making sure to click "same address for billing and shipping" because God knows why this isn't checked by default.
8. Pay for the book.
9. Be told in the mail that I will get my digital code on the website.
10. Go back on the website and search for 10 minutes where that code is. (hint: order history > select order > big red button "Unlock the activation key")
11. Find out that the code is not yet available.
12. Go regularly on that website to get the code.
13. Meanwhile be told through social media (not mail) that the physical book will be delayed one month.
14. Wonder why I still don't have the code two weeks before the official release when I have the Master subscription tier
15. Find out that it's because I actually haven't paid: I only authorized the payment to happen in the future.
16. Manually say to the website that I actually want to pay right now.
17. Actually pay right now.
18. Get the code.
19. Go to https://www.dndbeyond.com/redeem-key
20. Input the code.
21. Be told that it's incorrect.
22. Find out that it's because the code has tons of spaces around it in the clipboard.
23. Input the code without spaces.
24. Get a random error 500 ("it's not you, it's me")
25. Find out that the book is not in my books list.
26. Go to https://www.dndbeyond.com/account/licenses to check whether it was actually properly added despite the error.
27. Sync my entitlements.
28. Congrats, I have my digital book.
29. Wait two weeks for the official release day plus a further month because shipping in EU.
30. Congrats, I have my physical book.

Thank you, @LaTiaJacquise, that would be very much appreciated.

In a more "checklist", this is my list of issues with the process.

• I not redirected to the EU store directly based on my location, or asked which store I want to use.
• Check the bill/delivery address checkbox by default, or reuse the check status from my last order.
• Remember my previous payment method, and suggest that one by default.
• I'm not charged at checkout, but I only accepted to allow further payment. Since Dragon Delves, I have to manually request the charge to occur after I authorized the payment, and again it's hidden in menus. As a Master-tier subscriber, I want my two-weeks-early access without having anything to do on that day.
• I've preordered a book, that I'm supposed to get on or close to the release date, but I don't get any e-mail to tell me there will be a delay.
• The entire code thing should not even exist: once I've confirmed and paid my preorder, I should get the digital preorder in my entitlements directly.
• If the code is necessary:
  • It's a code or a key, not both: use the same word everywhere.
  • It should be sent by mail when my preorder is confirmed: I shouldn't have to connect again to dndstore.wizards.com
  • The code should be easily accessible, not hidden in account > order history > order > "unlock the activation key".
  • When the code is unavailable, just say so: currently it's either nothing or a red box telling me to activate the code.
  • Double-clicking the code should select the code and nothing but the code, no extra spaces, so that I can copy/paste it very easily. A "copy to clipboard" would also be appreciated. Another solution is to have your redeem program to strip whitespaces from the start and end of the code.
  • Don't show an error 500 when my code was redeemed. If you couldn't log after I correctly redeemed, you should still show me the redeem succeeded.
  • The entire "sync my entitlements" should not even exist. When I redeem a code, automatically sync if you must, but don't force me to go there and sync manually.

Thank you for considering the entire process.