problem payment lack of 3D secure Braintree

Hello,
I am using Braintree for WooCommerce for my website https://www.educa-langues-enfants.com. Since few days some of my customers do not arrive to pay because the 3Dsecure is not installed well.

The support of Braintreepayments wrote to me :
“I have taken a look at your recent transaction history and I do see that these transactions were not 3D Secure-authenticated. Do note thatStrong Customer Authentication (SCA) requirements are mandated by PSD2, which applies to merchants and cardholders located in the EU.”
“In your gateway and, from our side, everything is set for the 3D Secure flow, but there are updates that need to be made to your client-side code and server-side code to implement it. That being said, I do see you are using a Braintree plugin for a third party, as such I would recommend reaching out to their support regarding 3DS implementation. In most cases, it is as straightforward as them toggling 3DS on for your checkout flow.”

So could you please help me to fix and install the 3D secure well in Braintree for WooCommerce.

For information the configuration at the moment is:
Transaction type : charge
debug mode : off
environnement : production
Fraud tools : basic
3D secure : Level : Standart
Supported card type : empty

Thank you for your help
Laurence