Same thing happened to me. For several years, I completed the Daily Set and searched on IE (now Edge). Each and every day, the Rewards page urged me to conduct other searches on the Bing app, the Xbox app, and with the Rewards app on Xbox. So I started doing just that... and within two weeks, my account was suspended in late 2023. No policies violated.
Searching the MS Community, I came across a post and reply that directed the user to submit a support request. So I started doing that, beginning late November. Never received a reply, and beginning mid-December, I started submitting a new support request every other day, through yesterday (Jan 9). Today, all fields on the support page are grayed out.
In addition to the text AlexL101 quoted from the message at the top of the support page, there's a link and invitation to view the MS Services agreement governing the program. But what's the f'king point? If MS won't review the support requests, why would I waste time reviewing this document?
The Rewards program is a colossal joke.