Hi Francis Hirst,
Since the issue occurs on multiple networks and even after reinstalling Windows, it may be related to how Windows is detecting internet connectivity rather than the network connection itself. The fact that browsers work while some Microsoft services cannot sign in is a useful clue.
As a next step, please check whether a proxy setting is enabled:
- Open Settings > Network & Internet > Proxy.
- Turn off Manual proxy setup if it is enabled.
- Restart the PC and test the connection again.
You can also test with a new local Windows user account to determine whether the issue is limited to the current user profile.
If the problem continues, please share more information as suggested by the Independent Advisor that may help identify what is affecting network status detection on the device.
Let me know if you need further assistance, feel free to ask me by clicking "Add Comment" or "Add Answer" if you cannot add comment so your response will be visible. Thanks for your effort.
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