Login to iCloud after forgetting security code- without an additional device

Hi,

I am trying to login to iCloud on my Mac and after entering the credentials, it asks for the security code which I used to setup iCloud.

I don't remember it and hence, I click on 'Forgot code?' button.

Then I get this-

I don't have another device. What should I do?

I still click on Use another device. and when I click on Can't approve, it says

I am able to login to iCloud in the browser and I have around 1000notes in it. I want to login to iCloud so that I can have the same in my local system. Will I lose my notes if I reset the encryption?

Edit: When I click reset encrypted data, it just logged me out and the cycle repeats.

Please suggest any workarounds.

Thanks.