BLING is required to follow local regulations, and some information such as your TIN might be required when opening an account. After selecting your tax residence, you might be required to add your TIN.
A Taxpayer Identification Number (TIN) is a unique identification number that is used by governments to keep track of individuals for tax purposes. You can generally find it on your tax documents or your pay slips.
If you are a French tax resident only, the TIN number will not be requested. You might need to provide a TIN if you have one or more tax residencies in addition to the French one.