Getting Error while Runiing Workflow Assessment Tool to scan for active SharePoint 2013 workflows

while trying to run the workflow assessment tool, we are getting an error of SharePoint Rest Service Exception because of which we are not able to fetch the SharePoint Online list of sites running on SP 2013 workflows

Error Logs:

2024-03-11 11:50:43.966 +05:30 [INF] Sending HTTP request GET "https://Tenant.sharepoint.com/_api/Web?$select=Id%2cUrl%2cRegionalSettings%2f*%2cRegionalSettings%2fDateFormat&$expand=RegionalSettings%2cRegionalSettings%2fTimeZone"
2024-03-11 11:50:44.214 +05:30 [INF] Received HTTP response headers after 244.5216ms - 401
2024-03-11 11:50:44.216 +05:30 [INF] End processing HTTP request after 263.8508ms - 401
2024-03-11 11:50:44.226 +05:30 [ERR] Error starting assessment job: SharePoint Rest service exception
HttpResponseCode: 401
Code:
Message: {"error_description":"ID3035: The request was not valid or is malformed."}
ClientRequestId:

PnP.Core.SharePointRestServiceException: SharePoint Rest service exception
at PnP.Core.Services.BatchClient.ExecuteSharePointRestInteractiveAsync(Batch batch)
at PnP.Core.Services.BatchClient.ExecuteBatch(Batch batch)