Read/write deployment key not working


Hi all,
I followed the documentation here:
I have my deploy key in github with Read/Write access. I have the same key in /edit#ssh with Hostname =
I removed the key from /edit#checkout
The result is that I can’t even start a workflow and I get the following error:
WARNING: Your build was not run - reason code (:no-ssh-key).

ERROR: We could not test this push, because the Github repo is missing a Circle SSH key. You can fix it by having an admin click the Add SSH Key button.

I tried putting:
- add_ssh_keys:

As the first step of my buld job (which is the entry point to my workflow) and nothing changed. Any suggestions?