RexSystem1 voteoriginally by @RunnyPilot on GitHub
Apologies in advance as I'm not contributing, but I just wanted to share that I'm experiencing the same issue. I'm also unable to download the Windows app.
EDIT: I was able to download the Windows app, but setting up an account is still the same: Network error during request.
EDIT 2: I'm happy to inform that I was able to create an account through the app, so it seems the core issue is from the browser. I was using the Firefox browser on Windows 11 25H2.
EDIT 3: Hopefully the last edit: I figured out that it's an issue coming from Firefox. I was unable to login on Firefox, but I was able to login on Microsoft Edge and Brave. I hope this helps anyone looking for a temporary solution!
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Comment by @RunnyPilot