Just speculation, but have you closed the Excel file at the perl end before the link is sent and accessed?

See https://metacpan.org/pod/Excel::Writer::XLSX#close()

Otherwise it is probably perhaps not a perl issue, as per the comment by marto in 11107125.

In reply to Re: Excel-Writer-XLSX : Excel file with warning messages by swl
in thread Excel-Writer-XLSX : Excel file with warning messages by rajan

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