How do I find out what community standards I violated

Ok if that is true do you know where I can find that it's not allowed and why everyone else is not getting ban for it?

This is the part of the rules you broke:

Give another person access to your Microsoft account

• Sell or attempt to sell your gamertag or account to someone else
  
• Sell in-game content outside of official in-game mechanisms and stores
  
• Trade game lessons for Xbox gift cards or other compensation
  
• Buy a game from an unauthorized seller
  
• Share ways to fraudulently get Xbox Live Gold subscription codes for free
  
• Try to get out-of-policy refunds or compensation from Xbox support
  
• Give other players the impression that you’re a Microsoft employee
  
• Pretend to be an employee of a game developer
  
• Intentionally represent yourself as a player other than yourself to cause drama
  
• Charge another player to help them complete a level in a game
  
  If you see someone else doing the same then report them & that way they'll be investigated & the appropriate action will be taken.
  

Ok if that is true do you know where I can find that it's not allowed and why everyone else is not getting ban for it?

What the person above went through and to check the status of the suspension and ask for a review. You can check the Microsoft guidelines there they explain what can lead to a ban and suspension.

Sincerely, Fernando.

Ignore the Independent Advisor,they've given out the incorrect info yet again.

Support are nothing whatsoever to do with enforcement & can not help.

You would need to go to the enforcement page HERE for info on your suspension & to file for a case review if eligible,which you probably aren't as it's a 2 day suspension.

Selling "runs" or "carries" is against the rules,even if it's for in game currency,which is most likely the reason for your suspension.

No they are completely no help. It's pretty bad when I pay for this service and can't even get a reply from them.