Hello @nadine.benharrath ,
Glad to know your issue has been resolved.
To resolve this issue, I would request you to check the Databricks runtime version.
It seems that your Runtime includes Scala 2.12 but your package is from scala 2.11
Try installing this: com.microsoft.azure:azure-eventhubs-spark_2.12:2.3.17
to resolve the issue.
Hope this helps. Do let us know if you any further queries.