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The launcher team has been informed and have opened an internal ticket to get this addressed but as Andrew mentioned, for now, you can try pasting in the above string to get past it and allow you to play as normal.
@chickensmasher - Hello there! Would you mind starting a new thread for your issue (that does not seem to be related to the OP in any way) where you describe how to trigger the misbehaviour in a step-by-step way for our QA to have a solid repro. Also what kind of result you would expect instead, and we'll see what can be done!