The record
In a post dated November 25, 2020, a user describes asking Siri to call a family member and hearing a brief acknowledgment before an error asking them to try again. They say other voice requests, such as opening an app, behaved normally. They note that all relevant settings and contact options were turned on, that the problem began after switching from an iPhone XS to an iPhone 12 Pro, and that the same request worked from their Apple Watch. This is one person’s account and does not establish how common the issue was.
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A documented user report, not an independently reproduced test or an estimate of how often the problem occurs.