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SSH-Keyscan Does Not Return a Key

I am trying to retrieve the ssh key from a Cisco Switch and get the following output:

[root@localhost] ssh-keyscan -T15 172.20.10.11
# 172.20.10.11:22 SSH-2.0-Cisco-1.25
# 172.20.10.11:22 SSH-2.0-Cisco-1.25
# 172.20.10.11:22 SSH-2.0-Cisco-1.25

I’ve ran the same command on a Cisco Router and it returns a SSH key.

What could be the issue?