Work around is to use the -o option and specify KexAlgorithms with the correcct option.
ssh -o KexAlgorithms=+diffie-hellman-group1-sha1 firstname.lastname@example.org
List of errors from devices
The following are errors that are returned when trying to ssh to a device.
Cambium 450i PMP Equipment
Unable to negotiate with 192.168.0.1 port 22: no matching key exchange method found. Their offer: diffie-hellman-group1-sha1,diffie-hellman-group14-sha1