French case: Sending an invoice based on the SIRET

Hello,

In the context of the French e-invoicing standard, the identifier used to route the invoice to the correct recipient is the SIREN for a French taxable customer, and the intra-EU VAT number for a customer located in another EU country.

Which transport type should I use?
If I set transport_type_code_for_contact = "b2brouter", I get an error saying that the contact’s email address is mandatory.
In my case, I should not have to provide it, because I want to send the invoice using the SIREN. Our clients do not always know their customers’ email addresses.

Thank you in advance.

Regards,