Question / Help You Tube demands Keyframe Rate Change

Streaming to You Tube from a Tricaster NDI via OBS has returned an error message. You Tube says "Please use a keyframe frequency of four seconds or less. Currently, keyframes are not being sent often enough, which will cause buffering. The current keyframe frequency is 8.4 seconds. Note that ingestion errors can cause incorrect GOP (group of pictures) sizes."

Any idea where the Keyframe setting needs to be changed? In OBS or in the Tricaster?