I have just tried this and its working.
MS Support haven't confirmed they fixed it however! But adding an Application Segment now works and does not fail on the tenant I am testing.
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When creating Quick Access configuration in Quick Access | Create Quick Access configuration I get:
Network access settings
Application operation failed.
no further information is provided in the error.
I do have a connector set up correctly and on in the default connector group.
I have just tried this and its working.
MS Support haven't confirmed they fixed it however! But adding an Application Segment now works and does not fail on the tenant I am testing.
I had the same problem two days ago, now it's solved, you can try it
I am still getting the same error. Logged ticket with MS support and waiting for 5 days and still nothing....