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Unexpected $device:xxxxx User Activity in Mixpanel – Insights Needed

·Sep 19, 2025 06:31 AM·

Since last week we started consistently getting some $device:xxxxx users showing up in our mixpanel- Our platform is behind login, so it's very uncommon for us not to have that data available. Is it something you guys also started experiencing?

2 comments

· Sorted by Oldest

Unexpected $device:xxxxx User Activity in Mixpanel – Insights Needed | Mixpanel Community

Julianne Bozzini
APP
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Hi Filip- Julianne from Mixpanel Support here! This is likely specific to your project and tracking. One thing to note is that there is an ID Merge delay after 'Identify' is called, where it can take up to 24 hours for user identities to be merged (usually it happens within a few hours of the call, though). This means that events sent by a user just before they log in might still be associated with the $device_id rather than the user's distinct ID until the merge is complete. If the anonymous users aren't due to the delay, I'd recommend checking a few things: • Identify failures- if you're on Original ID Merge, you can see this on the 'Identify' events themselves. On Simplified ID Merge, events will have a property $identity_failure_reason if impacted by a failure. • Enabling debug and trying to recreate the behavior to see what might be happening. When going through the user flow. You can also submit a ticket via our web form for more specific troubleshooting. When submitting the ticket, it would be helpful to include a link to an anonymous profile and any debug logs.
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Filip B.
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Thanks Julianne, we'll test those out 🙂!
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