Access an old Xbox live account

So the old console (xbox1s) would be the home account with the xbox live account log in and the new xbox series x would have access to the live?

@Lestat, can you access none xbox services through the old silver live account?

in short old xbox live account lost, still want same Facebook on new account, can't access old xbox account to unlink, and Facebook doesn't show my Facebook as connected but when I try connecting Facebook to new account it says it's logged in to the old
account.

From the sounds of it you created a new account for Live instead of promoting your old one.

You promote offline accounts by signing in to it, pressing the guide button (the big silver one) and then choosing the Join Xbox Live option.

If your new account is automatically signing in you can access the old one by again pressing the guide button and pressing X to sign out. You'll now see the option to Sign In and how many profiles there are on your console. Select that option and you should
be able to access your old account again and promote it to Live access if you wish.

All saves are locked to the profile they were made by, so using your old account is the only way to access that progress.

Did you try these troubleshooting tips to get access to your old account? Try this link to access the tips.

support.xbox.com/.../xbox-live-sign-in