I’m going to say it is a moral issue, because how we treat others, including lying, can be good or bad, or have good or bad consequences.
I agree with @tinyfaery that morality can be subjective, but I also agree with @hominid that lying can cause harm and that why I see it as a moral issue. I think it is immoral to abuse a spouse for instance, and lying can be abusive. It harms the relationship.
I admitted to lying by omission on a recent Q. Omitting I am an atheist in some social circumstances. A jelly tried to tell me that isn’t a lie, and I disagree I believe it is. Different definitions of lying also play into the subjectivity of the issue.
I think for safety it is ok, even good, to lie. So, yes lying can be moral. As a jelly said above, Jews in the attic is one example. Or, a child saying their mom can’t come to the door right now when there isn’t even a parent home is a good lie.