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Fallback attributes are defined when you create new experiments. Also accessable via Overview (tab) > Targeting and Traffic. So instead of just using an id field like

sessionId

as your hashAttribute, you can also provide an alternate id such as

anonymousId

in case the user does not have their primary hashAttribute.

is there any update I have to do into code? @happy-autumn-40938

Yes, you'll need to (1) ensure a StickyBucketService is implemented and (2) ensure both attributes can be passed into the SDK. https://docs.growthbook.io/app/sticky-bucketing#setting-up-sticky-bucketing