iOS app never invokes Actions, while desktop works perfectly

I’m seeing what appears to be an iOS-specific issue with GPT Actions. Environment: * Custom GPT using Actions (OpenAPI) * Desktop ChatGPT: Works correctly * ChatGPT iOS app: Does not work Observed behavior: * The iOS app never attempts to invoke the action. * No HTTP request reaches my server. * There are no entries in my server logs. * Desktop immediately invokes the same action using the same GPT and same account. This suggests the model never decides to call the tool rather than the request failing after invocation. I’ve confirmed: * OpenAPI schema is valid. * Authentication is correct. * Endpoint works. * Desktop consistently invokes the action. Has anyone else seen the iOS app skip Actions entirely?