We have a sharepoint list with 6.5k items. we have created 4 separate views using indexed columns as filters. All 4 separate views have less than 2k items each. One of the 4 views can be exported to excel, the other three return the threshold error message. Any suggestions?
I have encountered a similar thread before. One way you could try is to create a new view from the existing view to see if it works.
Please refer to this post: Excel fails to download SharePoint List data