Thanks emsr2d2 for your response!
This is what my manager replied -
Fitted is the past tense act of fitting some thing. i.e. I was fitted for a tuxedo.
In this case you would need to use fit because you have a past tense reference to the action itself. It should have been, "The templates that were used never fit the scenario."
PS you took "never" out of my sentence and replaced with "did not." Please tell me if it sounds correct with "never" in it.
Ah!
I'm embarrassed to say your manager is right. The simple past of "fit" in this context is indeed "fit".
Did the template fit the scenario?
Yes, it fit very well.
I think "fitted" has become so commonplace that it didn't even occur to me when I read it!
I still don't like "never". I assume that you and your manager are talking about a specific example of a template being used inappropriately. I think "never" is a little over the top. It is possible, I think, that perhaps in the past, at a time that neither you nor your manager is aware of, that that particular template might have fit the scenario very well.