Had the same problem, but I cross gen from Xbox one software to Xbox s software, since I did that last week I cannot sell players or bid on players I get the same error, I was passed around for days with the chat advisors and absolutely useless, at one point they told me to clear my Mac filter etc, then I had the problem of my Xbox then connecting to the router, I stopped playing FC in 2020 due to the stress, I thought I would come back play for fun, but jesus it's even worth, never again you can't even get full access to play and the solution still isn't solved, also happens on the web app.