Can't find the option for the Oathbreaker Paladin Class

I wish that were the case. It is a good guess I had thought about too. Unfortunately nothing is listed there at all at this time.

While I received and opened the order today, Marketplace Order History still shows this as shipping. It could be that must resolve first as Delivered before digital delivery happens, though that is an unlikely scenario.

The most likely case is that the Marketplace listing details were incorrect; but, just in case this is a legit defect, I've submitted a few tickets and have kept the original support email updated.

This on line gaming is designed to take your money and give you nothing. Go back to books and paper. SAVE YOUR MONEY.

Quote from Melkiyon >>

This on line gaming is designed to take your money and give you nothing. Go back to books and paper. SAVE YOUR MONEY.

Digital books on D&D Beyond generally cost significantly less than paper books.