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@mandymactx It would be great if they made these things "opt in" rather than "opt out". That said, the way to turn them off is to go to your Profile Settings and uncheck the boxes next to the things you don't want. Look for "Allow Solo Challenge WordMasters to start matches with me". *Note that once you have changed it, it takes a few days for them to actually stop challenging you, but eventually they will.
These challenges are annoying. I have tried the Profile settings thing and it has not worked. They are ruining a good game with this stuff.