Nick Brown, Based on the doc reference and from my understanding of your ask.
From the doc - "SharePoint Online indexer isn't supported when Microsoft Entra ID Conditional Access is enabled."
'Conditional Access isn't a simple enabled/disabled setting' - this statement is not specifically outlined in the the doc that you referenced.
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As per the documentation, you need check if your tenant has conditional policies to restrict devices. If this is the case, the indexer is not supported:
If your Microsoft Entra organization has conditional access enabled and your administrator isn't able to grant any device access for delegated permissions, you should consider app-based permissions instead. For more information, see Microsoft Entra Conditional Access policies.
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