I think job duties does matter in intl grad stream.Did you apply under the graduate stream? If so, job duties won’t matter that much as long as you consistently proved your employment.
If you applied under the healthcare or essential stream I’d attach a LOE via webform and an updated letter of employment.
Ircc says job needs to have a noc. There are jobs which don’t have a noc. Hence they asked for job duties listed in reference letter.
Current employment
To be eligible, you must
- be employed in Canada when you submit your application
- be employed in any job that exists in the National Occupational Classification website