Hi Harisha,
Thanks for asking the question in Microsoft Community.
Per your description, you are using Flow to convert SharePoint list items to PDF. As our forum focus on how to deal with the out-of-box issue of Office 365, we are really sorry for couldn't provide a better suggestion for you. We sincerely recommend you raise this in Microsoft Power Automate Community, which is the official forum about Building Flows. Experts there would conduct in-depth research on the problem you met and can provide you with more professional help.
Appreciate your understanding and hope you all good during the COVID-19!
Best regards,
Madoc