activation email not working

-- HikaShop version -- : 5.1.1
-- Joomla version -- : 5.2
-- PHP version -- : 8.1

Hello,

After registering in Hikashop checkout, I no longer receive an activation email from Joomla?

Very strange and we will undoubtedly overlook something, but when I place an order as a Guest (or logged in user) I receive the confirmation email with a registration link. So this one works.

But if I set it to register during the checkout, you will receive a message that an email with an activation link has been sent, but you will not receive anything.

Or could this be related to the new custom emails from Joomla 5.2?
Would you mind taking a look at what we may be overlooking?