The notifyList is a list of static email addresses all account creation notifications for the source should be sent to. It does not support variables like you are trying to do.
However, setting the notifyAccountOwner parameter to true will send an email notification to the identity the account was created for via their work email. This seems to be what you are trying to achieve.
SailPoint doesn’t have documentation for the values within accountCreateNotification yet, but you can sort of piece them together via the documentation for the previous API this configuration replaced:
and the corresponding API deprecation post on this forum: