The method reject() does not exist on Laminas\Permissions\Acl\Acl. It seems like you code against a sub-type of Laminas\Permissions\Acl\Acl such as Ecodev\Felix\Acl\Acl.
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Ignorable by Annotation
)
If this is a false-positive, you can also ignore this issue in your code via the ignore-call annotation
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return $acl->/** @scrutinizer ignore-call */ reject('the current user is not active');