@mathew butterfield, Thanks for posting in Q&A. In Fact, Microsoft Intune suite license is an add-on to Microsoft Intune Plan 1. For Microsoft 365 business license, based as I know, it doesn't include Microsoft Intune Plan 1. But Microsoft 365 Business Premium include it. I think you need to choose Microsoft 365 Business Premium license instead of the standard one.
Hope the above information can help.
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