On some configuration (namely, some of Igalia's EWS bots), keyring cannot find a valid backend.
<rdar://problem/73429887>
Created attachment 418008 [details] Patch
Bug fix for this sort of thing: https://ews-build.webkit.org/#/builders/36/builds/25972
Comment on attachment 418008 [details] Patch rs=me
Committed r271687: <https://trac.webkit.org/changeset/271687> All reviewed patches have been landed. Closing bug and clearing flags on attachment 418008 [details].