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Cloud Migration Setup error Invoking endpoint failed with HttpStatusCode - 401 : Unauthorized

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I am getting an error I've never seen before while trying to migrate BC OnPrem 23.1 to BC Online 23.5.
I did this migration with these exact OnPrem and Online versions for a different database last month and did not get this error message.
I am using the same SQL connection string I always use (I just edit the database name).
SQL user I use for the connection is sysadmin and db owner.
Any ideas?

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