:tobyp - do you have a link to a failing build? I think what needs to happen is
Bug 1992783 Comment 4 Edit History
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:tobyp - do you have a link to a failing build? I think what needs to happen is something like [D263603](https://phabricator.services.mozilla.com/D263603), where I added dependencies on the various `winappsdk` fetches. My guess is that I missed some Thunderbird builds somewhere. (as I did with the mingw builds)