Whirpool Hot Tub Won't Work With 2 Single Pole 20 Amp GFCI Breaker
If Line Neutral Connected Even Whirpool Tub Is Not On Breaker Trips. No Connection Made On Load Neutral. Tub Requirement Power Supply Is 240 V , 20 Amp 50/60 Hz
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A GFCI trips between 5-6 milliamps. You can be electrocuted at 30 millamps. If the GFCI is tripping it could be 50 milliamps leakage to ground or more.
Call a certified electrician.