Data Connector / Genesis Rest 3.1 API returns only 500

I have a very old data connector integration that has suddenly stopped working entirely.

Every request to this endpoint returns a 500 error with no details:

https://api5.omniture.com/genesis/rest/3.1/?method=Export.CheckDataRequest

Is anyone else experiencing a complete outage with this API? I know data connectors will be EOL on August 1, but for, now I expect the requests to continue working as before.

I'm not getting any response from Adobe support, nor seeing any updates on their status page.