Latch is catching on my 40-049 lockset

A quick learner from PA says:
March 10, 2021
Installed 40-049 mortise lockset on tenants storm door.
She is complaining that the latch is "Catching" when turning the key. I experienced this yesterday when trying to fix.
What can I do to resolve?
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Tom from SWISCO responded:
March 12, 2021

I'm not exactly sure what you mean when you say the latch is catching" Maybe something needs to be lubricated or filed down a little. Take another look at the installation video to see if there was something you missed. This should cover everything.
Complete Mortise Lockset, Brass
Complete Mortise Lockset, Brass
40-049
$72.02
How to install the Swisco 40-049 Mortise lock set.
How to install the Swisco 40-049 Mortise lock set.
VIDEO
WATCH >
How to flip a storm door mortise latch.
How to flip a storm door mortise latch.
VIDEO
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