Chromium 131 is far too recent to trigger an incompatibility warning. With Amazon, you might not get away with it, but with a lesser streamer, simply changing the User-Agent could make it look like you have something other than you have. The use of Client Hints (here) has cut down the effectiveness of switching the browser's User-Agent.
Well, it seemed possible, it would be interesting to know what could cause it, then, my browsers, which are always updated to the latest versions, NEVER have the issue.
And
Sebastian001, I too tried to make it known to the OP, it should not overall interfere with downloading from Amazon. Hopefully they realized that and are happily downloading now.
They seem to have indicated it is possibly working now, in their second post.