I have not received mixpot

We were able to determine that you have received the MixPot Rewards that you did not already own. Keep in mind that this content was automatically applied to the account you watched TGA with, and the DLC may need to be redeemed in-game. Check your 'Ready
to install' list for the following content:

• Goat Simulator
• Warframe Prestige Pack DLC
  
• Halo Wars 2 Kinsano leader
  
• Forza Motorsport 7 E3 Driver Suit
  

Let us know if you are able to find that content!

I still have yet to receive the mixpot

Hey there, sre you searching for Mixer, Mixpot promotions? Please visit xbox.com/mixpot. Quantities are limited – only the first qualified viewers will receive the MixPot. Due to the popularity of MixPot, some viewers may not receive any content. Viewers
do not have to watch the entire briefing to qualify. You will be notified after the stream is over with more details regarding your MixPot.

Same here. I received the inside Xbox mixpot but still have yet to receive the e3 one.

From the MixPot FAQ:

Xbox MixPot FAQ

During some of the Xbox Live streaming events on Mixer, we’ll be rewarding viewers by giving away MixPots, These MixPots will vary by event and can include different games and downloadable content (DLC) for each event.

Quantities are limited—only the first qualified viewers will receive the MixPot. Due to the popularity of MixPot, some viewers may not receive content. Viewers don’t have to watch the entire
briefing to qualify. You’ll be notified after the stream is over with more details regarding your MixPot.