The "activation code 100" is often a script that runs a local KMS emulator (a crack). These programs are frequently bundled with:
If you have purchased a legitimate Volume License MAK key for 100 devices, here is the correct activation process: microsoft office 365 product key with activation code 100
Do not share this MAK key publicly. If it leaks onto a piracy forum, Microsoft will deactivate it. The "activation code 100" is often a script
If you are an IT manager or business owner needing exactly 100 activations, you have two official paths through Microsoft: Do not share this MAK key publicly