While I found a very similar error reported here (https://community.atlassian.com/t5/Atlassian-Migration-Program/Migration-fails-on-user-migration-phase/qaq-p/1959043) it's unfortunately not the same.
With the exception of a warning about heap size (we're using 2GB on a fairly small instance of about 15 active users), all the other pre-checks pass fine. Our on-prem site is licensed through to next year and we're using the trial license for cloud that runs for the same period in order to do the evaluation and migration. JIRA version is 8.2.5 and Migration Assistant is 1.6.8. All users on-prem are from JIRA's Internal Directory rather than managed from a domain or SSO vendor.
When trying to migrate from on-prem JIRA to Cloud using the Migration Assistant, it fails almost immediately on the Users and Groups section with the following error:
"100:Server to cloud migration payload format is invalid"
I can't find that described anywhere. Migration settings are :
|Users and groups||You have chosen to migrate all users and groups from the Jira directory|
|Group membership||Users and groups will be migrated separately. Users will not be given project permissions and will not be added to your license.|
In atlassian-jira.log, the following error appears around the same time but may be unrelated:
2022-04-28 17:18:31,637 http-nio-8087-exec-296 url: /jira/rest/migration/latest/user-interface/log; user: adam.hough ERROR adam.hough 1038x12195x2 12gf2iu 192.168.177.79:49627,192.168.177.56 /rest/migration/latest/user-interface/log [c.a.j.migration.userinterface.UserInterfaceLoggingResource] api/fetchProductLicense: Fetching server products failed - Error: Request failed with status code 401
at t.exports (https://office.talus-tech.com/jira/s/d542cm/802005/e05263495498dc1e48fbd663242d5834/1.6.8/_/download/resources/com.atlassian.jira.migration.jira-migration-plugin:static-resources/fe-resources/vendors.80904690ae541d91481d.js:155:3048676)
at t.exports (https://office.talus-tech.com/jira/s/d542cm/802005/e05263495498dc1e48fbd663242d5834/1.6.8/_/download/resources/com.atlassian.jira.migration.jira-migration-plugin:static-resources/fe-resources/vendors.80904690ae541d91481d.js:186:1298)
at XMLHttpRequest.p.onreadystatechange (https://office.talus-tech.com/jira/s/d542cm/802005/e05263495498dc1e48fbd663242d5834/1.6.8/_/download/resources/com.atlassian.jira.migration.jira-migration-plugin:static-resources/fe-resources/vendors.80904690ae541d91481d.js:155:3047683)
I worked with Atlassian support and finally tracked the problem down to a group that had no name. I couldn't do anything with it from within the Admin UI so used SQL to manually remove the offending group from the cwd_group table; initially I just renamed the group via SQL but it still wasn't usable via the Admin UI which is why I opted to delete it. Once that group was removed, the migration made it past that initial sticking point.
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