When entering the cutover credentials for a Single Label Domain (SLD) (also known as a domain with no top level) in Migrator Pro for AD you are unable to proceed if you use a SLD for the source domain in the field for "FQDN of Domain (e.g. contoso.com)''.
The Save Profile button remains greyed out. This is because it is expecting a suffix and won't allow an entry without one to be saved.
To work around this, you need to temporarily add a suffix to your SLD name, for example .local.
Once you have done that, you will be able to save the profile. You must then modify the entry in the DirSyncPro database to correct the temporary value of SLDname.local that you used.
In the [ADM_Credentials] table of the DirSyncPro database you need to find the entry for the cutover credentials you just added.
select * from ADM_Credentials where CredentialType = 'Cutover'
Note:
It will have SourceDomainName=SLDname.local
The CredentialId is the value of the entry you need to change.
Update it to remove the .local:
update ADM_Credentials set SourceDomainName = 'SLDname' where CredentialId = #
(where # is the value you retrieved from the previous SQL select query)