Pushing Audiences to Destination with Different Mapping

[riballor]

Hey Community,

I have a question related to pushing Audiences to a destination.

Providing an example first:

• Day 1 -> I pushed some audiences to META with the personal email address as the mapping.
• Day 2 -> I pushed more audiences to the same META destination, but I changed the mapping to phone number and deleted the email address mapping.

My question is, will the mapping change on Day 2 impact audiences pushed on Day 1? 

I see that lately, a lot of identities are being excluded. I'm not sure if the wrong mapping has been used or that a change might impact old pushes.

Thanks Ricardo

[KumarRishii]

@riballor Yes, changing the identity mapping (e.g., from email to phone) can impact how audiences behave at the destination — especially if the same audience segment continues to be updated or refreshed.
I will suggest you to If possible, don’t change identity mappings mid-stream without re-evaluating the impact on active audiences. Consider duplicating the destination or archiving the old one if you need a clean break.

[riballor]

Do you know if there is some documentation that state this?