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ODP tracking across multiple sites, same domain
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Hello Jonathan,
ODP Web SDK supports sharing the VUID across subdomains through the cookieDomain configuration. The SDK source explicitly states that it should be set to the highest common domain for cross-subdomain tracking, otherwise, the cookie defaults to the current host.
My understanding is that both sites would need to use the same ODP account and Tracker ID. The email submitted through zaius.customer() should provide a fallback for identity resolution. ODP can associate different VUIDs with the same known profile once the same email is submitted, but the anonymous journey would remain split until that identification happens.
If this doesn't solve your problems, it may be worth contact Optimizly Support with the configs details from your website
Aug 20, 2026 14:07
If we have a multi-site CMS instance with ODP tracking implemented, is there a way to track visitor across multiple sites in the same domain? All of our sites are anonymous but we do collect some identifiing information in RFI forms; we use email address. What I'm seeing though is the VUID is different across both sites. Is there a way for both sites, if they're on the same domain (I.e., site1.site.com and site2.site.com) to use the same cookie and VUID?