Summary

The migration of Advanced Roadmaps is blocking due to below error :

java.util.concurrent.ExecutionException: com.atlassian.jira.bc.EntityNotFoundException: Custom Field Id for ARJ_TEAM not Found 

Proposed Suggestion

JCMA  could have a precheck to determine if the Server or Data Center instance has null PROPERTY_KEY='com.atlassian.teams:rm-teams-custom-field-team'.

Workaround

• First validate issue with your source DB by running below query :

SELECT * FROM propertyentry WHERE PROPERTY_KEY='com.atlassian.teams:rm-teams-custom-field-team'

The query should give no results to corroborate the established theory .

Next,

Please proceed with the following:

1. Take a backup of your database.
2. Execute the following insert in Jira's database.

INSERT INTO propertyentry (id, entity_name, entity_id, property_key, propertytype) 
VALUES (<unique-id>, 'jpo-team-management', 1, 'com.atlassian.teams:rm-teams-custom-field-team', 3)

 Please replace <unique-id> with a unique id in the table.
3. Retry the migration.

Please contact Atlassian Support if the issue persists.