Xbox One account locked.

Its because of region switching. You account locked it out because you xbox says one thing and you microsoft account might be different. The code are recognized in the one area and you shouldnt switch regions , it can be seen as fraud and lock your account

My xbox account is an adult one.

I tried all your manipulation, it seems to be definitively locked.

Sadly, I doubt it. The content is locked to the account and you'd (preferably) want to remove it. It is possible for Xbox One.

Password protect your Xbox Live profile remotely

If your Xbox Live profile is downloaded to another console and it’s not password protected or your password becomes compromised, you can remotely remove the password so that your profile can’t be accessed. Here’s how:

Step 1: Change your Microsoft account

Go to accounts.live.com and sign in with your Microsoft account.

Under Account information, click Change next to Password.

Alternatively, you can change your Microsoft account password from your console by following the steps at Change your Microsoft account password.

Note If your downloaded Xbox Live profile doesn’t require a password at sign in (the Remember Password option is turned on), changing your Microsoft account password won’t prevent someone from signing into your Xbox Live profile. In this case, you need to
complete the next step.

Step 2: Require a password to sign in

Remove your Microsoft account password so that your Xbox Live profile can’t be accessed from other consoles. You can do this:

On your computer

On your Xbox console

Computer steps: Remotely require a profile password

Go to My Account.

Under Settings & Preferences, click Xbox 360 Profile Protection.

Sign in with the Microsoft account (email address and password) that is associated with your Xbox Live account.

Select Require Profile Download to require that your profile be redownloaded from Xbox Live, using your Microsoft account and password, before it can be used on a console. Any existing copies of your profile will no longer work, and profile changes or
achievements that are not saved to Xbox Live will be lost.

Console steps: Remotely require a profile password

Sign in to Xbox Live with your account.

Go to Settings, select Account and then select Account Security.

Select Password at Sign In.

Select On All Other Consoles.

If you choose this option, all other consoles will require your Microsoft account password for sign in (or redownloading of your Xbox Live profile).

If you believe your Xbox Live account has been compromised go to Xbox Live account security.

Important Unfortunately, Xbox LIVE customer support cannot reset Microsoft account passwords. If you need to request a Microsoft account password reset, please contact customer support.

Account billing locks only apply to the service that initiated the lock

Unless it was your card that issued the lock then they would have a choice of one lock out till you call or your card gets completely locked till you call the card provider from the email it I'd xbox billing lock which takes awhile to fix

as it has to go higher then customer support