Giant Red ! to the Face

So I’ve been working all day and haven’t been on the forums. I am excited to play some Halo 5 with a buddy and get a huge red ! over slayer.

My friend is playing without me.
My NAT is open.
Can someone enlighten me?

Your NAT really only affects your host eligibility in games like CoD, so if H5 has dedicated servers, it doesn’t matter. Try a hard reset for your console and try restarting your router/modem too.

I have done both, and checked my ports