Same issue here - works fine in production, but not in sandbox (where I really need to test things!) I've sent a request to Tech Support - about 1/2 hour ago now..... - we'll see how much of the day gets wasted on non-production... As a side note, we've been using PayPal for around 15 years (one of the first million to sign up... 🙂 - and have never used sandbox due to all the issues.... - though recently PayPal started not refunding the fees on production accounts (maybe because we always used them because sandbox doesn't work!!!!), so now we are forced to use the NON-WORKING sandbox.......
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