In this Dawn CQ build for a change that modifies cr-buildbucket.cfg, the presubmit check for LUCI files failes:

https://ci.chromium.org/p/dawn/builders/luci.dawn.try/presubmit/b8934913778123819680

The output contains this

** Presubmit ERRORS **
Validation request to luci-config failed
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HTTP Error 403: Forbidden
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It seems that either the bots or the service accounts are missing ACLs to use luci-config. Can they be added? Thanks!