The "report" argument does not exist.

I'm bumping this to critical because the bug here renders the module useless.

Same here, but not multi-site.

I hit this snag using site_audit:4.0.0-rc5

Site Audit module now has a 4.1.1 version, which may have resolved this issue, but needs additional testing.

I have an internal ticket to pick this up during maintenance cycle, but it may be some time before we can come back around to this.

FWIW I am seeing this report flag error on 4.1.1 after installing the module, submodules and trying to run some audit drush commands as outlined in the readme.