Adding SSH-Supported MAC

Good day all, we have a client that has informed us that they will only support the following 4 HMAC entries of:
•hmac-sha2-512-etm@openssh.com
•hmac-sha2-256-etm@openssh.com
•hmac-sha2-512
•hmac-sha2-256

Our current listing of SSH-Supported MAC does not include any value with hmac-sha2*

How do we add the hmac-sha2 to our current list of supported HMAC’s?