No place to enter icloud verification code on MacBook

Enter with your Apple ID and password at www.icloud.com , don't enter admin password rather click on cancel .

Then enter few starting alphabets of Apple ID they will automatically filled up , click on enter key the password field will also be filled up automatically , again click on enter key .

Click on allow in maps , a code will be displayed on the Mac desktop( slightly drag and drop the code window you will see empty verification field ) enter the code , if you click on trust this browser it will not ask for code .

If you didn't get the verification code , click on resend .

This method is used when another iPhone / iPad is " not " signed in with same Apple ID and password on the same network .

In your case the iPad is signed in with same Apple ID and password thats the reason its showing the code on it , you have to use that code , come to Mac and enter the code and get it signed in .

See the articles https://support.apple.com/en-in/HT204915

https://support.apple.com/en-in/HT204974

Note : once 2FA is created in new versions of Mac / iPhone it can't be disabled .

See some screen shots .

If you see a password box, enter the password (ABC) followed by the code (123) or ABC123 (no spaces).