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DataFlow - Unable to save new table: Ambiguous Errors

Will you please advise how we can debug errors such as these? I can successfully load the same M Query in the Power BI Desktop but it always fails in dataflow but unable to tell why as it only gives the following details.



Activity ID: e39cd50b-cd54-4a9d-9a1d-8cf099d37dd1
Request ID: 1bd35f80-9616-1e74-02c9-b72cfc77e570
Correlation ID: 87bbe0b5-0d97-cc3f-a858-a2a7a186826c
Status code: 500
Time: Tue Oct 19 2021 15:41:20 GMT+1300 (New Zealand Daylight Time)
Service version: 13.0.16982.44
Client version: 2110.2.08110-train
Cluster URI:

Status: Accepted
Community Support
Status changed to: Accepted
Community Support



A similar issue has been reported internally, so stay tuned. 

IcM 267029301