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Hello @Romeo Guevara
Based on your description, I understand that Visio can read the Excel file but cannot generate the diagram. The Create button on the Datatab is disabled, and you also cannot find Data Visualizer in the list of add-ins.
First, based on my research, the Visio Data Visualizer add-in for Excel was retired in March 2026. Therefore, you may no longer be able to find or activate this add-in in Excel.
Please refer to the following article: https://techcommunity.microsoft.com/blog/microsoft_365blog/retirement-of-the-visio-data-visualizer-add-in-for-excel-and-next-steps/4465747
Could you first confirm which Visio licence you are currently using?
In my environment, after I select an Excel Data Template, the Excel data is imported automatically.
Could you therefore provide the exact steps you followed? Also, did you start from a dedicated Data Visualizer template or from a blank Visio drawing?
If possible, could you describe the exact steps you followed to import the data?
Based on my research, I found an article that provides detailed instructions. The expected process is as follows:
- In the template preview, select your preferred unit of measurement, and then select Create.
- On the first page of the Create Diagram from Data wizard, choose Select the Excel workbook.
- Under Select a table or a custom range in the workbook, select the table containing your Excel process data.
- Select Finish. This accepts the default values that Visio automatically fills in on the remaining pages of the wizard.
The diagram should then be created automatically inside a container. Additional Visio pages may also be added, depending on the size of the flowchart.
Could you please confirm at which step the Create button becomes disabled? If possible, please also share a screenshot of that screen and let me know whether any specific error message appears. Please refer to the following article for the correct steps to import the data:
https://support.microsoft.com/en-us/visio/create-a-data-visualizer-diagram
I am just another user on this forum, not a Microsoft employee. I hope this information helps you in some way.