I have a customer who is interested in a trial version of Automation Hub. I created the Automation Cloud instance, and I’m listed as the Admin for the Tenant. I’ve logged out and back in again. However, I don’t see the three dots beside the tenant that allows me to enable the Automation Hub on this tenant. What am I doing wrong?
Thanks
You will have to add it from Services. Refer below steps:
Navigate to Admin → Click on your Tenent → Click on Services → Click on Add Services → Check the Automation Hub → Click Add.
It will take a while to refresh the Tennent. Once refreshed, you will see Automation Hub.
Thanks,
Ashok 
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