I've receive 4 text messages with an Apple Id Code - late in the evening. I've not been trying to sign into my Apple Account. Someone is trying to get into it. How do I find this information?

They could be fake and somebody is phishing for information.

They could be real and is just something you weren't expecting. Sometimes it seems Apple's systems seem to think you are doing something new when you aren't, it's just the system resetting itself.

There's a possibility it is real.

Click on this link "If you think your Apple ID has been compromised" --> https://support.apple.com/HT204145

'Checklist: If you want to see if anyone else has access to your device or accounts' click here --> https://support.apple.com/HT212021

Security and your Apple ID - https://support.apple.com/HT201303

Contact Apple for help with Apple ID account security - https://support.apple.com/HT204169 "This article provides country-specific Apple Support contact information for customers seeking help with their Apple ID password or other security-related issues." Better for directly reporting an issue.

There isn't a way to find out who is trying to sign into your Apple ID. Since you have 2 Factor Authentication enabled, unless they can access one of your trusted devices, they won't be able to sign in.