You are seeing the error:
HTTPException:HTTP response '503: Service Unavailable'
When communicating with your connected server (CPI -> xxYOUR_SERVER_NAMExx.com)
This can be intermittent or may have just happened for a short while before functionality returned and the iflow was running successfully again.
This can be generic and can have a number of possible causes.
Cloud Platform Integration - Process Integration (CPI-PI)
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