Hey Sara,
Yes! This is possible. You can use any Event Aggregator license on up to 10 different domain names.
There is currently a bug with our license keys page where only one domain name will show up, but this is just a UI issue! The license will actually work on multiple different domain names without issue. We’re hoping to fix this UI issue in the next few weeks if all goes to plan.
Please let me know if this helps and if there are any other issues or questions I can try to help with!
— George