I think I am going mad, as I was pretty sure that yesterday I could do this.
As a workaround, I am using the created date, but I didn't have to do this previously.
You are not going mad, we did change something 🙂
The "Key" column now shows next to the idea summary.
To sort by idea Key (what you call number):
You should also add the "Key" field to the view via the "Fields" menu
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