Hi @LizPS 
See @Jim-from-Ohio's answer here: "to efile it you have to select it to be efiled along with the Ohio state return on the federal information worksheet" from Is anybody else missing Ohio Form SD100 for 2024? Let us know if this answers your question. 

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Well, that was certainly not intuitive...OSD is a "state" to be filed electronically.  So OH & OSD.

But still not resolved...I've added OSD as a "state to file electronically" on the federal information sheet. I've marked Form SD-100 on the Ohio information sheet and filled in county 2501 but when I QuickZoom to SD-100 it does not populate.  I've opened blank SD-100 and marked to "Activate SD-100" and still no form.

I was told yesterday "Proseries no longer supports e filing Ohio School District Returns." TERRIBLE!

I was told yesterday "Proseries no longer supports e filing Ohio School District Returns." TERRIBLE!

you were told a lie