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These checks are meant to help you plan your migration by taking into consideration Xray related constraints. The checks will let you know if the group of Projects that you are migrating contain any Xray links to data outside of these Projects. 

If there are any such links, Xray will let you know which projects should be added to the migration to avoid ending up with missing links in the Cloud instance. This  This check should be done before any migration is started.

The preflight checks are available when the Jira Cloud Migration Assistant is installed and a version of Xray supporting the migration to Cloud is also installed. The page can be found in the Administration → Manage Apps → Xray → Cloud Migration. Here you should fill all the projects for your migration and then press Validate. If there are no errors, you may now leave this page and proceed with your migration through the Jira Migration Assistant. If there are any errors you can see the details and steps to fix the issue. See the following example.

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There are no more errors meaning that these two projects can be migrated together safely.  We can now go back to the Jira Migration Assistant and plan our migration with both projects.

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