@Jay *****
FYI, regardless of the information you provided, the airline will be happy to charge you for a virtually unlimited number of extra bags.
This is how the airline earns a profit.
Don’t rely on the booking dot com or airline interface, call the airline and ask.
I regularly see people fly with 12 large foot lockers worth of luggage, exotic cars, and even race horses.
Just because it’s not on the drop down menu doesn’t mean it’s not available.