Q: Keychain waiting form approval from an old phone number

Hi,

When I try to set up my Key Chain on my mac book pro, It tells me it's waiting for approval from another device.

Then it sends a text to an old phone number I no longer have.

I already deleted the old iPhone 4Sattached to this phone number on iCloud.com, and made sure I don't have this phone number on my app store account or iCloud account.

I also have an iPhone 5C, and manage also to get the text with the code approval, I did enter them, but it still tells me that my mac book pro is not approved.

Do you know how I could get rid of the old phone number, and How I could make sure my macbook pro is verified?

Thanks,

Alex