Processes in Microsoft 365 for setting up Office apps, redeeming product keys, and activating licenses.
If you use Windows 11 it should be installed by default.
If you want to directly start the app then I guess you can start the executable located here:
C:\Program Files\WindowsApps\Microsoft.GetHelp_10.2409.22951.0_x64__8wekyb3d8bbwe\GetHelp.exe
When started then maybe the (localised) app name will present itself and maybe you can find this app within the start/search menu.
I agree it's hard to find and even harder when a localised version is to be discovered (like 'Hulp vragen' in Dutch).