U can come to the main entrance ring the bell for security and tell them to tell hr you need to speak to hr theyll come out to speak to you. Or call the number they gave u if its not a local issue.
Not generally, especially now because of covid there are no visitors without a pressing need. If you are a past employee, you already know the lifelines in order to contact for specific reasons. If you are a potential employee you should talk to your recruiting agency representative.
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