How do I add vertical errors bars (vertical lines) to a chart in Excel? The "vertical error bar" option is missing

Question

I created a simple line chart in Excel 365, and I'm trying to add a vertical line to the chart at a specified date. I created the chart as a combo line chart (for the data) and a scatter plot with a single point on the important date. I planned to use vertical error bars on the scatter plot to create a vertical line, as I've done numerous times before. This time, though, there is no option to add vertical error bars to the point. The only option is to add horizontal error bars.

What's going on here? How do I add these vertical error bars? To add the error bars, I went to Chart Design --> Add Chart Element --> Error Bars --> More Error Bars Options.

Screenshot 1: Chart and Data

Screenshot 2: Chart Type Options

Screenshot 3: Vertical Error Bars option is missing

Answer 1

Hmmm. Not able to replicate the issue. When I clicked on the point and added error bars, it first added horizonal only. But then I clicked on arrow to the right of the Error Bars window and selected "More Options".

Then it displayed a Vertical Error Bar window. Then back to the chart and I removed the horizontal error bars.