Auto boundary detection not working

I'm trying to map a rectangular zone with clearly defined lawn edges.

I tap start mapping,
Response: Checking successful
I click Next
I click Exit Station
Response: Calibration completed
I select Auto Boundary Detection
I click I got it
I guide the robot to the perimeter of the lawn, I set the starting point
I click Set Starting Point
Response: The starting point has been set

End then

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And then?

The robot doesn't start and there is no message.
What should I do once the starting point has been set?

I also tried the manual mode, but this resulted in a complicated map (!) for a plain rectangle zone and finally didn't finish successfully either.

Hi there,
If you’re having trouble creating a working zone, try manually driving the robot around using the Erase tool. Once the full map is built, you can expand the lawn area or split zones later inside Map Editing. I’d suggest clearing any existing zones first and re-scanning the lawn perimeter from scratch.
Quick heads-up: Auto Boundary Detection only picks up the outer lawn outline right now. It won’t register no-go zones or connecting paths, so double-check if any of those are being falsely flagged.
Stay close to the robot while running the auto boundary scan—it keeps it safe and helps capture clean edges. If something glitches mid-scan, just switch to manual remote mode right away.
Should the boundary scan keep failing after trying all this, send over your unit’s SN code and upload a system log. Leave the robot connected to Wi-Fi for the next two days, and our technical team will look into what’s causing the issue.

I'm sorry, but this is no answer to my question.
I give you every step of the process and want to know what I have to do once the starting point has been set.
Please be precise, what action I have to take.
How do I get Auto Boundary Detection to work?

Notice that I added another comment to let you know that I tried the manual way but that didn't work either.

I didn't  manage to create any zone at all.
What is the erase tool?

I found out that the station should be included as much as possible in the zone. This is something that should be explained in the manual.