Who actually uses your software.
There are two groups.
The first is the signing committee. The board chair, executive director, or Grand Secretary who evaluates platforms, signs the contract, and goes through onboarding. This is the person every vendor sales pitch is aimed at. This is also the person every vendor support relationship is built around.
The second is the actual users. The volunteer treasurer who runs reports once a month. The membership chair who processes new applications. The event coordinator who pulls a registration list. The secretary who emails the chapter newsletter. The new member who's trying to update their address.
These two groups overlap, sometimes, but usually only at the top. In an organization of 200 members with twelve officers, perhaps two people were in the room when the software was selected. The other ten, and the 188 members downstream, were not.
The buyer is sold; the user is left to figure it out. Whether the platform actually delivers value depends almost entirely on whether the user-side ever catches up.