gmail – Why does Google want to verify a phone number (which I do not even have)?

Verify

After entering my password and username, Google asked me to verify a mobile number. After I clicked on the next option, as you can see, I came across a red loop.
Although I do not have a mobile number, Google insists that I enter a number and has no other options.
Google has assumed that I have a mobile number, but this is not the case and I do not have one.
Google did not anticipate the replacement option and I was practically in a dead end.