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Saqib_AliSaqib_Ali 

Page Layout Assignment Not Deploying Through Change Sets

I'm running into an issue where I'm trying to deploy a new Lightning App using Changeset. The app includes a  new page layout and a new record type for the Contact object.

The Changeset includes the following:
  1. Custom Fields
  2. Record Type
  3. Lightning Pages
  4. Page Layouts
  5. App

For some reason, the page layout assignments, which I have verified as being paired up with the correct record types in the dev, are not carrying over into the staging environment.

The page layout, record type, and new fields are all appearing in the destination environment, but the assignments aren't working.
Raj VakatiRaj Vakati
Yes .. Page layout assignement will be migrated only if you migrate the profile along with change set  .. 


Are you migrating the profile also .. becareful if you migrate the profile system permission wil be reset in target org .. 


Other wise you need to pagelayour and Record type and App Builder page assignemnet manually after deplyoing 

Refer this link for ANT

https://help.salesforce.com/articleView?id=000187235&type=1