> Though I've heard it's quite common in large enterprises that are fragmented due to a lot of aqui-hires, for corporate HR to forget or miss people I've worke

> Though I've heard it's quite common in large enterprises that are fragmented due to a lot of aqui-hires, for corporate HR to forget or miss people I've worked at small (<1000 people) firms where there were at least 10 different entitlements systems and removing someone was a nightmare. I can 100% believe that this also happens at large companies (due to acquisition as you mention) too.