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[ERROR] Failed to read the input data file. Please check your access rights. [FAILURE]
veyon-cli.exe authkeys import user/public %source%\user_public_key.pem
Is the file readable, i.e. can you run e.g. notepad %source%\user_public_key.pem? What happens if you replace the placeholder with a qualified path?
notepad %source%\user_public_key.pem