Unable to map Lotus Notes user to SharePoint List's people picker column.

We are trying to migrate Lotus notes DB to SharePoint online. and in the LN DB we have the manager column  (LN user column). We have created a list and added a People Picker column in the SP and we are using the Quest tool to migrate the LN DB. We have extracted the ACL users and mapped it and run the tool. All the columns are migrated properly except people picker column. we are getting the default user name instead of the actual person name ( We have mapped properly Lotus Notes DB User and SharePoint user - AD user in the user mapping section in the Quest tool)

Could you please help us to get it resolved this issue?

Thank you.

Regards

Srikanth M