For anyone wanting more details on what the actual fix was, see the marked answer, and Daniel Zhukovsky's reply to the marked answer, on this duplicate thread:
https://answers.microsoft.com/en-us/windows/forum/all/windows-linkphone-link-error-code-256/3b856702-7314-4cfb-b2ae-8d2de792d17a?page=2 In short, "This issue has been fixed through Windows Update on 11/27..."