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I have the same issue and I have been going circles for some time… There is currently no way to test creating a booking because
1/ the Appointments disappeared from the Sandbox Dashboard
2/ the sandbox access token used in the API explorer misses the APPOINTMENTS_WRITE role to create a booking
This is a very significant regression and is making it very hard to develop anything related to Square Appointments as a developer. It would be amazing if it could be solved rapidly.
I hate to even offer this option, because I know it will just means they kick this down the road. But I did find if I used the production URLs as a guide, I could paste the path to the various dashboard pages and get it working decently enough to verify my API calls, at least in most cases. It’s still very crude and the UI works nothing like prod, but at least I could make progress.