Woocomerce / Stipe : order conflict

I get this error / warning messager when trying to pay an order of a sub account on the woocommerce order page https://www.poulainsdecolipain.com/commander/ : An error occurred while placing the order. Check your order history or e-mail for an update before trying again.
I I check the sub account order section : I may pay the order !?! https://www.poulainsdecolipain.com/commander/order-pay/7942/?pay_for_order=true&key=wc_order_KfP1GJpgBERqm&_wca_initiator=action

Website is in French.

Thank you for your follow-up.
Damien

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