API outage > invalid refresh token?

Hi. From late yesterday afternoon Australian Time, we've been receiving this when trying to process orders via API connection:

{

"error": "invalid_grant",

"error_description": "The provided authorization grant (e.g., authorization code, resource owner credentials) or refresh token is invalid, expired, revoked, does not match the redirection URI used in the authorization request, or was issued to another client. The refresh token is malformed or not valid."

}

Would this be connected to this reported outage? 
https://status.myob.com/incidents/760092

Nothing else has changed locally.

Thank you.