SUSE Manager 3 - errors

We upgraded our SUMA 2 to 3 successfully and our client are working fine.

Then I successfully migrated a SLE12SP0 to SP1 using SUMA, but afterwards the server that was migrated could no longer use the activation key (KEY1).

Key1 - SLE12SP0
Key2 - SLE12SP1

So I tried to salt-bootstrap it (using KEY2) and i get this:
The host key needs to be accepted, to auto accept run salt-ssh with the -i flag: The authenticity of host ‘xxxx’ can’t be established. ECDSA key fingerprint is bb:ce:66:23:e3:3d:b2:07:cd:d1:0c:a9:19:bb:b6:3a [MD5]. Are you sure you want to continue connecting (yes/no)?
on the Bootstrap Minions web page.

So I tried to salt-ssh -f xxxx on the SUMA server and it states salt-ssh command not found.

Anyone have any ideas ?

How did you do this exactly ?