After doing so, people would be unable to send to EFT via SFTP until either the key pair was changed back, or the new public key was imported by trading partners. The issue was then made more complicated because people often tried to change the key back, but didn’t have a record of the password set up for the private key. This meant there was no quick fix.
The new generator now gives three options, with the default being ‘Just create keypair’. If this was selected, the keypair would be created and you would need to specifically import it into EFT and associate it with an account or site. The other options create the keypair and either set it as the host key for a site or import it into the key manager ready to be associated with an account.