Lo sentimos, no puedes realizar un pedido por Internet en este momento

Hmm.. And you said that many experts have looked at it and no one can see why you wouldn't be able to order online. I don't have access to review accounts here on the Community but I have a few other questions that I wonder if they checked for. 

• Did they say anything about the maximum number of lines you can have on your account and whether you have met that number already?
• Are you on an older rate plan that possibly has a line limit? Even if the older plan doesn't have a line limit, "retired" plans can prevent adding a line because the system does not see them as "eligible" for new lines. This does not mean that you can't add a line at all, just changes the process a bit. 
• Are we sure that the phone number you are using to log in is the one listed as the Primary Account Holder line? Sometimes those get mixed up and can prevent some things from working. 

I appreciate you sending the screenshot because a picture is worth a thousand words. I see that you can go to the Shop tab and select Add a line before that message pops up. If you just select a device or accessory, can you proceed with a new order?

Shopping on the website is great because of the different promotions and savings you get. I also like that I control the order from beginning to end and don't have to wonder if someone else is clicking the right buttons. (That might say a lot about me 😁) Is there a specific promotion your are looking for now, or just looking to save on the activation costs and stuff like that?

I know I have asked a lot of questions so far and they seem to be in different directions, but there are lot of variables that could be attributing to this and I want to get you the right answer instead of a vague one.