Apple ID iPhone 6s

Hi Olga0099,

Welcome to the Apple Community :-)

Your Apple ID is the ONE secure account you use to access all Apple services,

like the App Store, Apple Music, iCloud, iMessage, FaceTime, and more.

Re: I can’t log in in any way,

see if this discussion thread answer helps:

https://discussions.apple.com/thread/253802752

Else,

if you have been trying every way to log-in on your iPhone only:

Try logging in (link below) to your Apple ID account online,

and, if you can, check all is up-to-date there.

https://appleid.apple.com

OR

If your Apple ID has been locked or disabled – Apple Support

OR

Check your Apple ID device list to see where you're signed in - Apple Support

Hope something here works for you :-)

Log into iCloud on another device/computer and then try logging in on the phone.