This issue can occur if the User has been created but has not previously sent an emarketing campaign. Follow the steps below to resolve the issue:
- Sign in to Act! 365 as the affected User
- Send an emarketing campaign by following the article below:
How do I send an email campaign in Act! 365?
https://actcloud1.zendesk.com/hc/en-us/articles/202143755-How-do-I-send-an-email-campaign-in-Act-365-
- Once the emarketing campaign has been sent log-on as another User
- Send an emarketing campaign and the missing User will now be listed under Send As