Keep getting asked for my tel number

Hi Guys

New guy, first post, here goes

I use an Android mobile (Galaxy J3 2017) and have been using Whatsapp for a long time and not too long ago, I installed WA on my laptop. The reason I did that was because I find it easier using keyboard, especially on a long message.

However, recently, when I try to use Wa on my mobile, it asks me for my tel no, then a code is sent for me to insert, and then it works, but it is a pain in the a... so I don't use it

I have taken a screenshot but I dont see an option to attach?

James
Did what you said but same again, it says " will send code" but it does not.