Unsuccessful Teams Sign In Attempts from Russia

A coworker notified me that they had two unsuccessful login attempts from locations in Russia on their Teams accounts and asked me check. I had one from Primorskiy Kray, RU. Both of ours coincided with the same day the first OPM 5 bullet point response was due. There were no other suspicious log in attempts apart from those. We reported it immediately.

Did anyone else have this issue?

Teams > View Account > Recent Activity will show all recent login attempts. Report anything unusual!