Uppercase in username and i cant set queue

I want to set queue for users on Mikrotik, and for it i use .Net (C#) api.
every things is ok but some users exist uppercase characters in their username,but on database that i use all username contains lowercase characters.because of it i cant do queue for some users and occur below error,what should i do for this problem?

!trap=message=no such item.tag=…

Equalizing the casing is probably going to be the best course of action.

Whether to let your DB contain uppercase characters and updating it with the names from the router OR forcing all names into lowercase and updating all names at the router is your decision to make.

(I’d go for “case sensitive”, but that’s just mostly my preference, combined with my desire to NOT later deal with casing…)

don’t have any way that router check both uppercase and lowercase ?

None that I’m aware of.