KeyError issue - unable to find root cause

[buran]

So essentially, the argument is a report I run from a HelpDesk system which consists of three columns:

Quote:
workorderid,emailid,last_tech_update

well, that is strange....
you claim the file consists of three columns, which suggests csv file based on the header you show.
at the same time you try to load it as json file in the read_file function. I would expect you will get JSONDecoderError long before getting to KeyError.
What is the file actual file format? That is why I ask to see sample of the file. Help us to help you, don't make us ask same thing over and over again