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Can't sign in to Edge Dev with Microsoft Account
When I press the profile icon and then "Sign in", I get a blank popup dialog which never populates. As a result, I can never sign in to sync my profile. Additional Info I'm on Dev build 76.0.16...
I had the same problem In Windows Server 2019 .
Try to verify your account.
Settings-> Accounts-> Your info-> Verify
This issue was resolved after verifying my account.