Apple can't provide the number. It's not their database.
The number itself isn't the issue, it's what it represents: that your business is recorded in a large and reputable database of international businesses that is in widespread use by companies and governments.
D&B database is widespread in the US, not internationally. In fact, I own a credit card company/bank and never heard of them until I needed their number. Their database is large because they are filling it, not because companies request.
In fact, S&P and Moody's are the only ratings/registry that can get you anywhere in the banking system.
The number itself isn't the issue, it's what it represents: that your business is recorded in a large and reputable database of international businesses that is in widespread use by companies and governments.