Continuous failed Sync of a Data Source

Continuous failed Sync of a Data Source

I have had a Data Source set up in my Zoho Analytics workspace for a long time, but recently it has been failing every scheduled time. I don't remember exactly when it started, but I think it was about a month ago.
The details of the failed Sync are always the same, as shown in the image below.

When I refetched it manually, the synchronization happens without problem, as shown in the image below, but it fails again in the next scheduled time.

For the information, we have changed out Account Admin recently, but I'm pretty sure this problem started before.
What might be the problem?
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