[xocnad]

This also happened to me about a week ago and I had the same reaction/discovery process you did. OT but I wonder if there was a recent ramp up in these attacks. It was done against an email I do not regularly use that was attached to my account as an alternate and haveibeenpwned confirmed was in a data breach back in 2020.

[hunter2_]

I had been thinking someone with a similar address made a typo. But now I'm thinking Microsoft already considers this a known incident depending on whether a bazillion attempts were made in a detectable manner. I hope a successful launch at least demands a botnet and random delays/backoff.