Welcom Email on ExternalAuthorzer

We are using external authorizer as:
_authorizer.Authorize(our_auth_parameters);

_authorizer - default core ExternalAuthorizer class in nop

This authorizer has lines for sending welcome emails:
                        if (isApproved)
                        {
                            //standard registration
                            //or
                            //skip email validation

                            //send customer welcome message
                            _workflowMessageService.SendCustomerWelcomeMessage(currentCustomer, _workContext.WorkingLanguage.Id);

But for some reason only authorization works and email not added to queue.
Is it bug or require additional setting for email?

Hello, we don't have any special setting for send "Welcom" email, but the Customer.Welcome Message message template must be active and in its "Email account" field must be set an active email account

Hello,

Email account default and active. Welcome email template active too and set to this default email account.

We can see email messages in queue for successful payments but for some reason Welcome emails not added to this queue.

Thanks