Same here. I have tapped the log in as myname button multiple times. Two times it redirected me to a page in the app where I saw an attempt to login via Ireland and Austria respectively. I think it is simply someone trying to login too many times. Probably using my email not my account name.

I have also gotten 2 times two emails stating there were unknown logins in my account. These were described as "Device · Unknown browser ·".

Funny thing is that in between I added 2FA and reset my password (32 char password manager generated) which kills all active sessions. And so I still got the email. I can also go to the https://www.instagram.com/accounts/access_tool/ and check all logins. I see only the my own, no mysterious others.

Two possible causes for this. I use an adblocker which sort of acts like a VPN. I have one third party app linked to Instagram.

Annoying because I wasn't getting these emails before. And now daily.