The Azure jobs still use windows-2016 which is due for removal soon(TM).
@MoonlightSentinel created dlang/installer pull request #506 "Fix 22958 - Bump azure image to windows-2019" fixing this issue: - Fix 22958 - Bump azure image to windows-2019 The current image `vs2017-win16` is due for removal. https://github.com/dlang/installer/pull/506
dlang/installer pull request #506 "Fix 22958 - Bump azure image to windows-2019" was merged into master: - 42245f18d4f95496f8afdca3c81e192e09e1dfd5 by MoonlightSentinel: Fix 22958 - Bump azure image to windows-2019 The current image `vs2017-win16` is due for removal. https://github.com/dlang/installer/pull/506