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Once upon a time, I logged into my app using a Google login and the email address uominir@gmail.com. This resulted in a Firebase account being created with a doc ID ofEoCZmgsR4mdUIPWGX5CefHk8q5X2. I had, back then, allowed multiple accounts to be created for the same email address, but later changed it to prevent that; see first attached screenshot.

No, when I log in using the same email address but with the generic email signin, a second account is still created; see second attachment.