Unexpected Google authorisation error

[virsingh77]

Your Workflow URL

https://connect.pabbly.com/workflow/mapping/IjU3NjcwNTZhMDYzNzA0MzU1MjZjNTUzMCI_3D_pc

Your Task History ID

IjU3NjUwNTY1MDYzZjA0M2Q1MjZkNTUzMzUxMzI1MTYzNTQzNjBmMzUi_pc

Consent to Access & Modify

I authorize Pabbly Support to log in to my account and make changes to the specified workflow for troubleshooting.

I received an error while my worflow was entering details into google calendar: Request had invalid authentication credentials. Expected OAuth 2 access token, login cookie or other valid authentication credential. See https://developers.google.com/identity/sign-in/web/devconsole-project.
Strangely there was no change in credentials and the subsequent requests for the same workflow are running smoothly. It happended just for this one off event. What could be the reason? The workflow is 'Ecwid to Sheets' and the Task History ID - IjU3NjUwNTY1MDYzZjA0M2Q1MjZkNTUzMzUxMzI1MTYzNTQzNjBmMzUi_pc