PnP bulk user profile import job error

[SinghGurd]

I am working with PnP bulk user profile import API and my script works Ok in submitting a job using a JSON file that is stored in SharePoint library. I get a job ID back and query its status which comes back as Submitted and then changes to Processing after few minutes. However, job remains stuck in 'Processing' state for hours and then error out.

I am using Azure AD app principal for authentication and JSON file is really small with only three entries. Anyone know of why this job might be getting stuck. There is no helpful error message displayed anywhere.