Email verification is asked during order from guest

This message is now coming up in the process of checkout : “To view this page, you must either login or verify the email address associated with the order”. But we are not asking any verification to our clients !?!
https://www.anantamassage.com/checkout-2/order-pay/91624/?pay_for_order=true&key=wc_order_XOLCfhaaxzxCg

It must have come from the recent update.

I saw a similar ticket: https://wordpress.org/support/topic/email-verification-after-woo-order-from-guest/
But no reply yet.
Please help ?
Sylvain

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