It's a known glitch.
You are going to have to start by clearing all Disney related cookies from your browser, whichever one it is. That still doesn't work 100% of the time. Disney claims their site is optimized to work best on Chrome but when it comes to this issue, it's actually the worse, for me.
If you are using Chrome you can try opening a page using Incognito mode. I am hitting about 50/50 on this working. I like to try to stick to using Chrome since that's what I use for everything else, both on my PC and my MAC (and my phone too for that matter)
Next step is I open Edge, again clearing all Disney related cookies (I have actually set Edge to delete all cookies and cache each time I close since I only use it for websites that won't open correctly in Chrome). This works about 3/4 of the time.
If it doesn't work then I open a Private page in Edge. So far, this works