Solved: cannot edit draw.io diagram on confluence page

I'm not able to edit a draw.io diagram from the confluence page. We have 9 different draw.io diagrams on the confluence page and 8 of them are editable by hovering over the diagram and clicking the pencil icon

When I hover over the diagram that I'm trying to edit, the pencil icon is missing

Another way to edit is by clicking the draw.io diagrams link in the left sidebar on the page, clicking on the specific diagram, and then hovering over the diagram and clicking the pencil icon.

When I do it this way, I am getting this error:

I am not sure what to do to fix this. The diagram shows properly on the page but we have no way to edit this diagram or export it to create a brand new diagram.