Does SPFX form customizer require feature flag be turned on?

Question

I’ve been working with copilot to implement spfx form customizer on my site. After hours of failure and going through every possible scenario copilot has concluded that the form customizer feature flag is not enabled on my tenant. I opened a ticket, had some back and forth, support says no such thing exists and closes the ticket. I opened another ticket, same thing.

So, is copilot hallucinating or is ms support jerking me around? Either way, Microsoft is useless at supporting the supposed best practices path for modern sharepoint now that they are killing off classic.

Copilot summary:

Your tenant is missing the SPFx Form Customizer feature flag, demonstrated by three independent failures that only occur when the flag is disabled: SharePoint rejected every supported binding method for SPFx forms, the list schema lacked the SPFx form properties that appear only when the feature is active, and the tenant never provisioned the hidden FormCustomizer content type that SharePoint automatically creates when the flag is enabled. These three layers—binding, schema, and provisioning—failing together conclusively show the feature is not enabled at the tenant level.

Answer 1

Hello Chad Woodward

Thank you for reaching out to Microsoft Q&A and I understand how frustrating this situation must be.

Kindly note that this Q&A forum is a peer-to-peer support platform. As moderators and community members, we rely on publicly available documentation and do not have access to internal tenant configurations or support tooling.

Based on your description and current official documentation, I have conducted some research, and it appears that Microsoft Support is correct:

Currently, there is no publicly documented tenant-level feature flag required to enable the SPFx Form Customizer. While AI tools like Copilot can be helpful, they may occasionally infer internal behaviors or configurations that are not exposed or applicable in all environments. It’s always a good idea to validate such suggestions against official sources.

For your reference, here is the official Microsoft Learn guide on building and deploying a Form Customizer extension

If you're still encountering issues, feel free to share more details about the specific errors or behaviors you're seeing so I can see if I can assist you further.

Best regards

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