Conditional Exchange Access(onPremise). Sync doesn't work due to users DisplayName on Cyrillic alphabet

Conditional Exchange Access(onPremise). Sync doesn't work due to users DisplayName on Cyrillic alphabet

Hello All,
We have changed an attribute DisplayName in Active Directory and Exchange Server for the users from Latin to Cyrillic and now the synchronisation of the device details doesn't work with Exchange server. In the log file I found out an error "exception occured while converting string to JSON : Unexpected token COLON(:) at position 22785". This happens because from Exchange server the values like "DisplayName":  "":0GQ2 ;5:A0=4@ 5@<0=>28G" comes. 
Do you know how it possible to change encoding in the MDM server to get it possible to work with Cyrillic symbols. I suppose that I need to set the encoding to UTF-8, but I don't have an idea how it can be done.
Thanks of the answers!

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