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Running the edge on any corner of the stone works, where you are lightly rubbing the edge on the stone on a corner.

Here is a post on using the technique in the Advanced Honing Forum.
Hone a...

Jointing, is a technique to straighten an edge and or remove microchipping.

After setting a bevel, the edge can be rough, lightly dragging the edge on the upper vertical corner of the stone, will...

So, why was the edge flat?

Is there any spine wear or rust/pitting on or near the edge?

Have you lapped your stones?

Put 2 layers of tape on the spine and sharpie ink on the bevels, colored...