Magento 1 & FedEx Integration NOT WORKING

Hi there.

I connected my company’s website (Magento 1.9.1) to FedEx in order to include it as a shipping option.
I set up correctly (?) my Account ID, meter number, key & password.

What I achieved so far: By clicking to checkout the following message appears:

“This shipping method is not available, please specify ZIP-code”

When a ZIP / Postal code is added though, the option instantly vanishes itself, like there’s no FedEx shipping option in the website.
I have already allowed all applicable countries for shipping & set a max 5kg of packages.

Plz Help :’)

submitted by /u/No_Country8568
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