Sable Company Marine: Class Link Required

[Samutar]

So I am playing through the Crimson Throne path as a Ranger and can finally use my Hippogriff as a Sable Company Marine.

On the my PC I have no alerts that something is wrong, but on the Hippogriff I have two alerts and that red Triangle in the top right annoys me, even though i can figure it out on paper, (the OCD kicks in) the Red Triangle must go!

The warning are as follows:
Sable Company Marine: Class Link Required
Hippogriff Master: Monstrous Mount Required

Hero Lab is up to date, and I cannot figure out how to get the link to work or find the Monstrous Mount feat I get at 2nd level automatically for selecting Sable company.

Any help would be appreciated.