Lol, thanks for checking in. Nope. No luck. I even got a new Disney Visa just in case that was part of the problem. I WAS able to add the new one to my account but still unable to make any reservations. Tech support has not been helpful. Their suggestion was for me to call to make my reservations. 
I don’t know what to do beyond just sending more emails until I become such an annoyance that they try harder to fix it. I can’t imagine getting there for my trip and not being able to use MDE for reservations or mobile ordering or LL. That would suck.
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Did you log every TV, computer, phone out of Disney+ and log back in? Do your kids have TVs with it?
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We just tried again. All TVs, devices and phones. With a new password. No luck.
I know. I am at a loss. They have stopped responding via email. I know that a cast member I would get via chat or a phone call won’t have the resources to help and that they would just need to “elevate” it to tech support. Our stay is in 50 days. I will be so frustrated if I can’t buy LL online on my own when the time comes…or do mobile ordering for dining in the parks. 
I want to confirm your current situation … On your current MDE account you have linked in a single WDW resort reservation and nothing else. AND, you can step through the ADR process up to the payment step which always fails regardless of which credit card you use, even a brand new card. AND you have no Friends and Family linked to the account.
What if any parallel uses of the account, like disneygiftcards.com or Disney+ or Hulu?
Not 100% sure what you mean by parallel but we do have Disney+ and Hulu, etc, we have Disney Rewards via Disney Visa, I have Disney Gift Cards. We have 5 people in our family who use Disney+.
I did at one point get a password reset link from a cast member. I changed the password. We all logged out of all devices including TVs and logged back in with the new password.