Steam sub payment failed, getting strange error in Mog Station

When I woke up this morning and started Steam, I was shown an error message claiming my 30 day subscription payment could not be completed using my saved payment method. I have used this payment method for every prior payment, and a lack of funds is not the issue here.

I logged into the Mog Station to see if I could get anymore information, and when clicking the "Steam Payment" option under the "Subscription Renewal" category, I was given the following error message:

Code:

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The Square Enix Account Management System is currently processing upcoming service fees for billing.
During this period, you will not be able to do any of the following:

 - Add/Change Subscriptions
 - Retainer Service
 - Companion App
 - Update Payment Method
 - Add PlayStation®4 License
 - Add Windows® License
 - Add Mac License
 - Add Game Time Card
 - Cancel Subscription
 - Cancel Service Account
 - Cancel Square Enix Account

These actions will become possible once again after the billing processes have completed.
We apologize for the inconvenience and thank you for your understanding and cooperation.

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Can anyone help me? I am not opposed to changing my payment method if necessary.

Resolved. I received an email this morning once my game time expired informing me that my sub wasn't paid and my service was cancelled as a result. I was then able to access the Mog Station without any difficulties, and paid my sub. Sadly I don't know what caused my payment to fail in the first place, but considering there's two points of failure here, I'm assuming that either the account management system or Steam had a bit of a hiccup, possibly due to the new year (that seems to be causing a lot of tech problems for some reason).

If you found this thread via Google or whatever search engine and you're in similar circumstances, don't panic. While I recommend submitting a support ticket to Square and Steam, I am rather confident in saying everything will be OK tomorrow. You'll just need to setup your auto-payment again. If you're worried about your veteran rewards, I can personally say I didn't lose any progress towards mine.