I am in trouble. I updated my machine to macOS 27b1 and Okta Verify never even launches when prompted. Safari is entirely blocked from launching it, too - it only let’s me do in-browser flows with Chrome. I am blocked hard. Is anyone at Okta aware of this and working to verify?
If you’re able to get into your Admin portal, I would add Okta Verify at least as another option so you can approve from a mobile device instead of just Okta Fast Pass. This way you can use TOTP or the phone app notification to gain access. But as of now, yeah - Okta Verify desktop app does not work. Part of being in beta 
I too have noticed that Okta Verify has stopped working on my device, after which I stumbled upon this page.
I assume something internally broke with the latest update (couldn’t tell you what), and it seems Okta will be waiting a bit longer in order to officially support 27, It sucks, but as the other user recommended, It would be worth adding another method for now.
Okta officially suggests downgrading, but I’m sure that would be a hard sell for some, I would recommend getting or having a FICO key and Fast Pass, as it was also a God-send for me when I first started having this.
I hope we eventually get an ETA for 27 support.