It’s saying too many iCloud accounts have been logged on to my phone
What do I do if I have too many iCloud accounts in my phone
iPhone 6, iOS 12
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The message is not about too many accounts "logged on" your phone, but that you have already created the 3 iCloud accounts allowable on that iOS device.
Create one online instead. >>> https://support.apple.com/en-ca/HT204316#macos