Bulk migration not working ADMT 3.2

Any related info in Event Viewer?

I'd try to migrate groups and users separately.

Nothing in Event Viewer. We do separate user from group migrations.

we can only migrate 4 or 5 objects and then get an error.

Which object is failing to migrate? What error do you get?

https://social.technet.microsoft.com/Forums/windowsserver/en-US/51b3886c-5261-45a9-a11c-63fc480b0ec3/admt-group-migration?forum=winserverMigration

It is recommended to perform the migration in the following order:
Domain Global Group
Domain Local Group
User Account
Computer Account

Also, please do not migrate the associated group members when migrating the group.

Group migration:
Copy group members - not checked              
Fix membership of group - checked  
ID history - checked

User migration:
Migrate associated user groups - not checked
Fix users'' group memberships - checked
SID history - checked

We are definitely doing the following:
Copy group members - not checked              
Fix membership of group - checked  
ID history - checked

Logfile and screenshot attached.
Log.rtf
Screenshot-2020-02-21-at-20.02.07.png

have you tried with fresh accounts?

from error log it looks like ADMT is failing to contact either source domain controller or target domain controller

Check if ADMT is able to connect to both side DCs without any issues and its not trying to connect to unreachable DC, probably put ADMT server in same segment as domain controller

ADMT is installed on my target domain DC. I can get to both DC's from both domains as per the screenshots
Screenshot-2020-02-22-at-07.57.36.png
Screenshot-2020-02-22-at-07.57.10.png

Sorry, I am out of the office at weekends... So just a few links to check out.

Exchange server related issue (if you have one on source server and not on target server):
https://social.technet.microsoft.com/Forums/en-US/866e1ee4-1115-49a9-89ac-3c621df7dbd0/cross-forest-migration-with-admt-error?forum=winserverDS
https://samigoncu.wordpress.com/2012/02/08/wrn17561-admt-could-not-migrate-some-properties-for-this-object-type-user-due-to-schema-mismatches/

Please check these links related to DNS and ADMT:
Configure a DNS Server to Use Forwarders
https://docs.microsoft.com/en-us/previous-versions/windows/it-pro/windows-server-2008-R2-and-2008/cc754941(v=ws.11)?redirectedfrom=MSDN
Important information about setting up DNS for ADMT
https://social.technet.microsoft.com/Forums/windows/en-US/179ffa68-95a7-4dfe-8832-a57c92383f35/admt-will-not-migrate-sidhistory?forum=winserverDS

If nothing above helps you, I would start from scratch. I really like this AMDT series... From preparing Acive Directory to migration itself.
https://blog.thesysadmins.co.uk/admt-series-1-preparing-active-directory.html