Since I crowed about this so much I thought I'd post an update now that I have one.
I was first told that this was due to a nationwide outage and that once it was fixed I wouldn't have any problems.
Today I'm told that the 5-computer license is _either_ Mac or PC, as in you can install it on up to 5 Macs or up to 5 PCs but not a mix of both. To the support people that told me that, I shared two links:
https://ttlc.intuit.com/turbotax-support/en-us/help-article/product-delivery/install-turbotax-one-co...
https://turbotax.intuit.com/corp/license/desktop.jsp
The first is a KB article that clearly states you can install it on 5 computers (no restrictions on operating system). The second is the TurboTax EULA which, in section B.1 again states five computers with no restrictions on operating system.
So according to the support people it's one or the other, but their contract says both. If you're unlikely enough to find yourself in the same predicament as I did, I would encourage you to be insistent that you expect Intuit to honor their EULA and unless they can tell you where the EULA limits your choice of operating system then the terms of the contract require them to provide both.
Or maybe just buy the same thing from them twice. I made a stand on principle and was ultimately successful in getting a satisfactory resolution, but it probably was not worth the four hours that it took to achieve. Your mileage may vary.
