
Hi @Phillips, Keith ,
Great to know that and thanks for sharing the update here.
You are really amazing!
By the way, since the Microsoft Q&A community has a policy that "The question author cannot accept their own answer. They can only accept answers by others.". and according to the scenario introduced here: Answering your own questions on Microsoft Q&A, I would make a brief summary of this thread:
[What type of login does the new sharepoint migration tool need?]
Issue Symptom:
I've got a SharePoint 2019 on-prem server in production, and I need to migrate workflows from it to SharePoint Online. According to the SharePoint Migration Tool public preview, it can do just that. After installing it, I'm prompted for my MS login, which is no problem. When I get to the part where you can select "Workflows", and enter a source URL, I'm prompted for another login, but there's no indication as to what login the app wants - Active Directory, Microsoft, or any other type.
Current status:
Turned out, my login wasn't a site collection administrator in the source site. Once I added it to the source site, the app accepted the login.
You could click the "Accept Answer" button for this summary to close this thread, and this can make it easier for other community member to see the useful information when reading this thread. Thanks for your understanding!