So, when I first tried to change it to "EastHills4H", it went through even though it looked like it didn't. And I tried again before the change went through, which caused some sort of problem. I never deleted a group with either name but I could see the system getting confused with a second try to change the name. That makes sense, thank you!
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I'll try emailing the support email, although I don't have a paid group yet because the new name wouldn't work - fingers crossed...
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Kris