Been flying my Mavic on Periscope live streaming app using periscope producer for 8 months now.
This week I tried to connect to periscope producer and was asked to lower the Keyframe Interval on the drone. The drone is set to 720 @ 24fps.
It’s telling me to lower the Keyframe Invterval to 3.0 s.

I have uninstalled/reinstalled both the DJI GO 4 app and periscope app.
Any ideas?

Just tried Periscope today myself.  Same error.
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Video keyframe interval in seconds	4.063
	Max keyframe interval: 3.0 s.

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As far as I know there's no facility within Go 4 to change keyframe intervals, so this must be something you configure in Periscope?