A Welcome email is not sent to the client when they first purchased the Email.cloud product.
Release : 10.8.0
The Okta profile has not been yet created or upgraded.
Clients should first create their Okta profile if not done, if it was already created they should upgrade their profile by adding the site access ID's they received when they first purchased the ESS product.
Refer to step by step KB In order to Manage Broadcom Site IDs or upgrade your account.