We would like to know how we can create linked issues between one JIRA Agile to another JIRA Agile with different domains (different companies but all related)
You can link them using remote links. See https://confluence.atlassian.com/enterprise/federating-jira-managing-multiple-instances-461504624.html#FederatingJIRA-ManagingMultipleInstances-Remoteissuelinks
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