Error 504 on API calls using OAUTH token

Question:
error 504 on API calls using OAUTH token from the past 2 days. Not sure why? Can’t see any downtimes as well.

Product:
Ecommerce REST API

What are you trying to achieve:
I have a backend app to make bespoke invoices but everytime I send the POST request, I get an error 504 after 9 seconds.

What have you already tried:
I have tried removing the app and re adding it. Got all new tokens but still failing.

Additional information:

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