Can't connect to Xbox live in backwards Compabilty

So I was stuck in the same boat as you all and I looked through this thread and saw Wrong Reverend giving us a possible solution. I tried what he suggested and it worked! So I'm gonna expand on what he said a bit to hopefully help out the rest of you. At
the main menu of whatever game you're playing, press the "start" and "select" buttons simultaneously. You should get the old 360 menu popped up. Then go to the download profile option and enter in your info for your account. After that you SHOULD be able to
play! To anyone who isn't able to do these steps I'm sorry in advance. This worked for me so I hope it worked for others.

Hey there!

Did you get any error codes/messages when this issue occurs? if you do, please be sure to include those!

For now, let's give these steps a try and be sure to let us know how it goes:

1. Select All settings from the Xbox One guide.
2. Next, scroll down to 'System' and select 'Storage'.
3. Select Clear local Xbox 360 storage. Note: This will not affect your saves stored in the cloud.
   

Hey there Titans Rampage3,

To clarify, did you give the steps I posted a shot? What happened when you tried?

Hey all, happy to jump in on this.

Let's go ahead and try these steps to clear the local Xbox 360 storage on the console and see if that helps.

1. Scroll left on the Home screen to open the guide.
   
   Note Double-tapping the Xbox button will open the guide from any other screen on the console.
   
2. Select Settings.
3. Select All settings.
4. Select System and then select Storage.
   
5. Select Clear local Xbox 360 storage.
6. Select Yes and restart the console. This will not affect your cloud saved games or Xbox One games and profiles.
   

Open the game again and see if it works, let us know!

I held in the start and select button in and the old menu came up but there was no profile there to sign in with this is so weird plz help lol