First of all welcome to the community!
Export to excel functionality depend on specific report, so may I know report for which you are looking to export data.
Moreover, Jira Cloud has new Excel Add-in which is really nice to fetch Jira Data in excel, do have a look.
Here is a link to add-in - https://appsource.microsoft.com/en-us/product/office/WA200000556?tab=Overview
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