I recently moved a section of an on Premise Sharepoint 2013 to Sharepoint Online.

The main function of this section is for expense submissions, for this there is a library with a default form for employee expenses created via Infopath.

The form works and calculates fine, however upon submitting the form the following error is given. I have tried editing permissions for the submitting user to include edit and full control, but neither give any better results. 

Any idea what the issue might be?

[![Infopath Error](https://i.stack.imgur.com/CV1UH.png)](https://i.stack.imgur.com/CV1UH.png)