Unauthorized error when using OAuth

I'm using our OAuth integration to pull a private repo from our account, and we keep getting 403 Forbidden errors as of yesterday. Nothing has changed on our end, the client key and secret that we're using matches what I see in the OAuth integration.

This is the affected account: https://bitbucket.org/tutum/

The error is breaking our CI/CD pipeline and blocking some further Bitbucket development we're doing.