Started getting 400 Bad Request attempting to refresh OAuth 2.0 Tokens

We have Java code that would refresh OAuth 2.0 Code Flow Tokens based on this guide:

After having this running fine, I did make changes to our Java code, and noticed that I can no longer refresh tokens.

I figured my changes broke our code. However, I stepped back and created a pure Postman Request and am getting a 400 Bad Request in Postman:

Notes:

The POST Url is the Shard that came back as the api_access_point, to which we appended /oauth/v2/refresh
I double checked our Client ID and Client Secret, they are correct. Also this is a certified app.
The Test Refresh Token was obtained today

Are there issues with refreshing tokens on Adobe's side at the moment? Are others able to refresh tokens?

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