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How can I migrate the customers list from Studio 2017 to Studio 2019?

I have just installed Studio 2019 and have, in this connection, installed the Studio Migration Utiility app from the app store. However, I can see that my customer list from Studio 2017 has not been migrated to Studio 2019 and I wish to do this manually. However, I cannot find where the customer list is stored. Guidance on this issue would be most welcome, thanks.