Thanks so much for reaching out!
As a first troubleshooting step, could you please provide us with your complete system information in a private reply using the instructions found in the following link?
https://theeventscalendar.com/knowledgebase/sharing-sys-info/
In addition, can you provide me with the URL that you are trying to import, so that I can do some testing on my end?
Also, can you enable and check the Event Log under Events < Help to see if you see anything unusual?
Right under that is your Event Aggregator Status. Can you take a screenshot of what you see there?
Let me know if you have any other questions in the meantime!
Thanks,
Jaime