I'm sure they are aware of how to get the app signed.
But I'm not sure they're getting past the first item here:
Crashes and Bugs
You should submit your app for review only when it is complete and ready to be published. Make sure to thoroughly test your app on devices and fix all bugs before submitting.
thoroughly test, thoroughly test.
Because the Upwork Team app is not currently an apple-certified app, you need to disable the Gatekeeper setting on your computer. Please, find more information on how to do it here. I understand that changing permissions on your computer to install the app isn't convenient. However, rest assured that this is something that is going to be resolved in one of the future updates.
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