Do runewords work on non-ladder?

I tried to create a runeword “Insignt”, but it didn’t work.
Where did I go wrong?

Screenshot it and we can tell you, works for me

Most common mistake when trying to build an insight is to use a spear class weapon base instead of a polearm class weapon.

ty, this is my mistake

Could have been worse, you could have tried to make infinity lmao