Every time I go to the official sites for these tickets and get through the entire process, even entering my financial credit card info, it states " processing" then an Error message pops up with no explanation. Anyone else having these problems? I've ordered these tickets online a couple years ago and never had problems. Any advice?
My inn is ordering my tickets/time reservations. YOu might look to your accommodation for help.
You could inform your bank of the purchase; try a different credit card.
Uffizi, Accademia [etc] you can call:
https://www.visitflorence.com/what-to-see-in-florence/booking-florence-museums.html
Have you already told your bank you were going to make online purchases on foreign sites?
Otherwise, since you had no problems 2 years ago, you may be trying to use a card not enrolled in the new security protocols like Verified-by-Visa and Mastercard-SecureCode. In this case you must call your bank and ask to speak with a manager who knows what Verified-by-Visa is.
With those sites i have had to try up to the different credit cards to find one that was accepted.
The Colosseum requires a credit card with another layer of protection. This is MasterCard Secure or Visa Verified. If your bank participates in these programs you can set up a pin to use on these sites requiring it. I actually had to get a new Visa since my financial institution did not participate. I do not know if the other sites you are trying has this requirement but it seems to be becoming more popular in Europe.
Try a different browser as well