SSMS 20 is a 32-bit application, so you need the 32-bit provider for the import to work. See https://www.microsoft.com/en-us/download/details.aspx?id=54920.
Alternatively, if you have SQL Server installed on your machine, there is a 64-bit version of the Import/Export wizard in the SQL Server program group.
The next version of SSMS, SSMS 21, will be 64-bit, but it will not be out for a while.