Please to not try to use Financial Institution Names in Quicken using a z, zz or zzz - prefix. They are obsolete and soon to be deleted altogether.
I don't have any of these Personal Loan or new Savings or other-than-credit-card accounts myself. The 800-number at AmEx that specifically supports these account types should be able to tell you how to go about downloading with Quicken. One thing you could try is to see if, on the account's website, you can download a QFX file with transactions and then import this file into Quicken. This might make it possible to activate the account for subsequent downloading with OSU. … hopefully …