How registrants flow from Host into Mobly
When someone fills out your Host registration form, they automatically appear as a lead in Mobly — no upload, no manual sync, no extra step. This is the core integration: your registration page and your lead database stay in lockstep without you doing anything.
What triggers the sync
The moment a guest submits the registration form on your Host event page, Mobly:
Creates a lead in your Mobly org (or updates an existing one — see Deduplication below)
Adds that lead to the matching Mobly event with Registered status
Logs a registration activity on the lead's timeline
The handoff happens in seconds. By the time the guest sees the "Thanks for registering!" confirmation page, the lead is already in Mobly.
What fields come across
From the standard Host registration form:
First name
Last name
Email
Company name (if your form collects it)
Custom fields you add to the form (job title, dietary restrictions, etc.) are captured in Host but not currently mapped onto the Mobly lead. Most teams handle this by viewing custom-field data in Host's registration export, then enriching the Mobly lead manually for VIPs.
Where the lead lands
Open the corresponding event in the Hub and go to the Leads tab:
The new registrant appears in the lead table
Status column shows Registered
Source on the lead's activity timeline shows the registration event
If you're using the Mobly mobile app at the event, the same registrant appears under that event in the app — ready for check-in (see How to check in leads).
Deduplication
If a registrant's email matches an existing lead in your org, Mobly updates the existing lead rather than creating a duplicate:
The lead's persona (first name, last name, email) is refreshed from the registration form
The lead is associated with this event if it wasn't already
The activity log gets a new registration entry, but the lead history is preserved
This matters for repeat attendees and for the common pattern of pre-registered VIPs who later fill out the public form. No duplicates, no manual merging.
The "no email" edge case
If a registrant submits the form without an email address (rare, but possible if your form makes email optional), Mobly silently skips creating the lead. There's no error shown in the Hub. The registration is recorded on the Host side, but won't appear in Mobly until an email is added.
Two takeaways:
Keep email as required on your Host registration form unless you have a specific reason not to. Optional email = registrants that vanish from Mobly's view.
If you're missing registrants and don't know why, check the Host registration list for entries without an email — that's usually the cause.
What doesn't sync (yet)
A few things stay on the Host side and don't currently flow into Mobly:
Custom form fields beyond name, email, and company (see above)
Email-template engagement data — opens, clicks, bounces from invitations Host sent. Visible in Host's analytics, not in the Mobly lead.
Plus-ones as separate Mobly leads — currently the primary registrant's record is what syncs; plus-ones live in the Host guest record. Capture them in the mobile app on-site if you want them as Mobly leads.
These may extend over time. Talk to your CSM if any of them are blockers for your workflow.
Troubleshooting
"Registrants aren't showing up in Mobly."
Most common causes, in rough order of likelihood:
Registrant submitted without an email. Check the Host registration list for entries with blank email fields.
Host event isn't connected to a Mobly event. Verify the connection by opening the event in the Hub — the Registration tab should show "Host" as the active method.
Feature not enabled for your org. If your team is on a plan that doesn't include Host registration, the sync doesn't run. Contact your CSM to confirm.
Brief delay during high registration volume. Most syncs complete in seconds; spikes can push it to a minute or two. If leads are still missing after ~5 minutes, contact support.
Related articles
Preparing the event page — the form registrants fill out
How to check in leads — what happens at the event when registrants arrive
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