To fix Error 400 when signing into Microsoft account, follow these instructions i.e. use a different mehtod to sign in, ...
XDA Developers on MSN
This is the one network setting most people never think of when they have problems
There are several ways to troubleshoot the DNS on your network or device. First, try pinging a domain with its IP address.
Find out how to resolve Microsoft Phone Link not working with simple troubleshooting tips for your Android and Windows setup.
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