Why is WHT tax not defaulted on my AP Invoice

We have done WHT Tax setups for Malaysia. The tax point basis is Payment. However, even after the full payment of the AP invoice, the WHT tax is not generated on the invoice and the WHT Invoice is not created as well. Anyone faced similar issue? Please help with your experience.

Steps followed :

Step 1: Create an AP Invoice for Malaysia

Step 2: Pay the invoice using quick payment

Step 3: Account the invoice and check for tax calculation (We did 'Calculate tax' several times as well on the AP Invoice)

Thanks and Regards