I'm pretty sure that's just how the badging system works. Amazon is orders of magnitude too big for 'everyone has access to everywhere' to make sense. When I traveled I sometimes had to talk to people (or send email) to make sure my badge was activated in a new location, even for offices in a different city but the same business unit. There were also restrictions based on whether you actually worked on a particular thing, even for non-acquisition parts of the company.