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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 see a table with all the instance projects listed, select all the projects for your migration and then press Validate. If there are no errors, you can 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 issues.
Example: Project TT was selected for migration. The preflight checks found that there is a link to another project that is not part of the migration (BUXRAY).
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