Posting this as a new thread to avoid any confusion, as I just realized the old thread was marked solved.
The Power BI Publish button is greyed out in the desktop app. I've duplicated this on two different systems with two of our accounts.
One test was done by downloading normally the latest desktop version from powerbi.microsoft.com. The test on the other machine was done by installing via the Windows 10 store app and allowing it to receive updates. Same result both systems.
No problem logging into either the desktop app, or the online service, it's just that the Publish button is disabled in the desktop app.
PBI Desktop Version: 2.57.5068.721 64-bit (April 2018)
Windows 10 Version: 10.0.16299.402
Wth? I'm missing something obvious?
Can you share some snapshots and a pbix file? It seems good.