Siri AI in iOS27 has only been released in Beta at this time:
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With Apple’s 2027 software releases, users can now access new Apple Intelligence capabilities across apps. Siri AI begins rolling out today in beta in English, and will expand to French, Japanese, Korean, Portuguese, and Spanish next month.
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copied from: Siri AI, a profoundly more capable and personal assistant, is here - Apple
And not all features are available at this point in time, also depending on your region/country:
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Feature Usage Limits
Certain Apple Intelligence features that rely on server-side models are subject to daily usage limits, including but not limited to Siri AI, Intelligent Photo Editing Tools, Image Playground, and AFM 3 Cloud models in Shortcuts. Daily limits may vary by feature, request complexity, system demand, system policies, and other factors. Expanded access to such features will be available for a fee in the future. Use of these features is subject to the Apple Intelligence Terms and Conditions. Learn more at Apple Intelligence Usage Terms.
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copied from: How to get the next generation of Apple Intelligence - Apple Support
But, you can let Apple Techs know directly about your experience by using the feedback link:
Feedback - iPhone - Apple