When you copied the response code from Flexera, did you first save the file? While it looks the same, if the next is not encoded using Unicode UTF-8, then when you paste the text into the text box in AdminStudio, this error will come up.
More info on converting ANSI (another common text encoding to UTF-8) can be found at this third-party link:
https://smallbusiness.chron.com/convert-file-ansi-utf8-43115.html
Error 51306 refers to our FlexNet Operations product we use to manage license activation. I found this KB article on our Supplier division's Knowledge Base about the issue:
https://community.flexera.com/t5/FlexNet-Operations-Knowledge/Activation-not-possible-when-NOTICE-filed-is-not-UTF8/ta-p/2621
Following these instructions, you'll be able to load the saved file into the offline activation dialog to insert the response code that way.
If you are experience any issues with activating AdminStudio, please contact our Technical Support team and they can help you resolve this.
Expert Flexeran on AdminStudio, Workflow Manager, and Software Vulnerability Manager / Research
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