When you the error "You must specify valid values for the A3, P3, and T3 parameters" it means that the values you sent to PayPal are invalid.
It could mean that,
1) A3 is not a number
2) P3 is beyond the acceptable limits
3) T3 is not valid.
Usually, the problem is a combination of P3 and T3 issue.
In my case, it was sending more than 24 mos for P3. The solution is to convert T3=M to T3=Y and change the P3 to rounded up years, so P3=3. This solve the issue. I wasn't able to find any documentation associated with the acceptable ranges and user inputs to these 3 required parameters for integration recurring payment button.
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