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Hi @edderkopp,
Welcome to Microsoft Q&A, and thank you very much for reaching out.
Based on your description, I tested this on my side and was able to create subpages normally. To help narrow down the cause, could you share a bit more detail about the behavior you’re seeing?
For example, does the same issue occur in OneNote for Web? Also, please check whether the page you’re trying to convert into a subpage is inside a section group, as subpages can only be created in standard sections. If possible, try opening another notebook to see whether the issue appears there as well.
Feel free to share a screenshot in the private message I sent, this will help me better reproduce the issue and identify what might be causing it.
In the meantime, the Q&A Assist suggestion you received aligns closely with my initial troubleshooting steps, so it may also help guide the investigation while I look into this further.
Looking forward to your response.
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