This may be known but I am posting it just in case it it not.
Today I installed IPB 2.2 rc 3 on my ocpower.info site to be used as its forum to replace the smf one that is there now.
I downloaded both the forum software just in case any changed had been made and downloaded the converter today.
I then uploaded them both and installed ipb 2.2 rc 3.
After installing it I ran the converter, every thing except the members went fine.
On the members converter it was saying there was not legacy password table in the database so I looked and then made one and was able to convet the smf member over to the ipb database.
I am not sure if it was on purpose or a mistake to leave out the legacy password table.
If it is on purpose I assume then a new converter will be made.
I am posting this just in case it is not known.

I would bet they may not have a converter for 2.2 yet. The one you have is most likely for 2.17.

The conversion system for IPB 2.2 has not yet been released. They should be available alongside 2.2 Final :)

Ok thanks.