Same here. I was actually inactive for a while not doing rewards. I clicked the banner on my Windows 11 login screen and when it openend the browser to see my rewards dashboard I got the banned message. Submitting tickets isn't possible.
Using the devtools I actually tried filling the form, removing all the disabled state from the form fields. Did not help. When submitting I got an error saying "It's not you, it's us", asking me to submit a ticket using the same form.
I understand it's a free program but still, this is really unfriendly towards customers. I am glad I used the majority of my points earlier this year and haven't actually saved up more. I'll just give up on this program alltogether.