Hi @Chris Thompson ,
It seems that you have disabled uploading for Stream Classic but PowerPoint 365 is still uploading to both Stream Classic and Stream SharePoint, and only email notifications are being sent for videos on Classic. Microsoft Stream Classic is being retired, and Stream (on SharePoint) is replacing it. You should start using the new Stream (on SharePoint) by uploading your videos to SharePoint, Teams, Yammer, or OneDrive.
Regarding the current issue, you can try to troubleshoot by reviewing the settings in PowerPoint 365. Ensure that you have selected the correct upload destination for your video and that automatic uploads are disabled.
Please note that Microsoft is migrating videos from Stream Classic to Stream (on SharePoint) in a phased approach. You can check the migration schedule and learn more about the migration process in the Microsoft documentation.
Migration Overview - Stream (Classic) to Stream (on SharePoint)
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