Requester does not exist (users with international charecters)

Requester does not exist (users with international charecters)

I see that the question has been asked often, but I can't seem to find anything about any fix or solution or anything similar.

I create a request using the default template, if I choose a requester that contains non-international letters, I will get a notification saying that the requester dosn't exist, when trying to submit the request.
There is no problem if the user dosn't have international charecters,

Is there any solutions, or fix for this ?

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