Hello Huu Trong Luong
This is a known issue and is resolved with the 2021R2 release.
https://ansyshelp.ansys.com/account/secured?returnurl=/Views/Secured/corp/v211/en/ai_lmt/KIL160Licensing.html
For a workaround, you will just need to modify the ansyslmd.ini file manually to put the – back in after using the settings to add it without the hyphen.
Example: in Settings Utility, specify - ETAAnsys
In ansyslmd.ini – modify to: ETA-Ansys
They may need to save a copy of the ansyslmd.ini to the desktop and then replace the copy in C:Program FilesAnsys IncShared FilesLicensing to avoid permissions issues.
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