As jsites said, this is not user error. It isn’t even an error with the activation code itself, as the error shows before even being able to enter in the code. This was established early on in the conversation.
It is an issue that has something to do with the hosting environment and the plugin, and the issue is common across at least 2 different hosting environments I see listed here. This is something that needs to be fixed in the plugin. I plan on looking into it more when I get a chance.
