I think it is important to provide a document as per their instructionsI already have the employment letter with everything needed by IRCC except job duties ot has the main company X logo .
There's nothing I can provide for job duties except my manager's letter.
The question is:
1- can I submit my manager letter on blank paper without notarization?
2- Can I submit my manager letter with the logo of department (different than the one provided by HR but mentioning that this department is a member of X company)
It should be company headed paper
With real company address including contact information (they will verify it and its location map at least online ) etc...
The point is there are several aspects to inspect and verify in a document other than the duty narrative i suggest you put all efforts you can to make it as perfect as possible