We get this message:
Sorry, you don't have a license to use InfoPath Forms Services. Please contact your help desk
How can I get license to use InfoPath for services?
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As you are on Office 365 Small Business Premium, this plan does not include the Infopath Form service. This is enterprise feature and you have to buy the different subscription.
InfoPath Forms Services is supported by Office 365 Enterprise E3/E4/A3/A4/G3/G4/K1 for Government plans. Please check this: SharePoint feature availability across Office 365 plans