Apex Coin issue through steam

Figured I'd just make a new post as the one I responded too didn't get much of a response.

Today and yesterday I've had issues trying to purchase Apex coins through steam. 
Here's the process of events: 
1. Open the store within apex
2. Push tab/click on the coins option at the top right
3. Click on an amount (in my case $99.99)
4. Steam window pops up with the price and 'authorize button'
5. Click on the authorize button
6. Steam window closes immediately and the purchase shows as failed within steam.

Here's a list of things I've tried:

1. Adding the funds directly to my Steam wallet and then trying to order.
2. Updating my drivers
3. Restarting my PC
4. Launching steam in big picture mode
5. Calling my bank to make sure there isn't an issue with my account
6. Trying this on another PC altogether. 
7. Copying the link that opens in the overlay into a web browser and attempting to place the order there.
8. Fully logging out of steam, closing down steam via task manager, logging back in to purchase.

I have a video of this issue in case it helps, but anytime I click 'authorize' when trying to place the order the overlay exits and the purchase fails.

Through the steps I've taken, I assume that there is an issue on the backend somewhere.