It's a "security feature" implemented in Hotmail, it does ask for an alternative authentication by requesting another email account or a cell phone to send you an activation code, then they let you into your account again.
Microsoft just want to collect private data about you help you protect your account in cse you lose your password. I've been asked myself and have to gave another email for they to collect
Hi and welcome to SevenForums,
The only people that can help you is Microsoft,
I've been there and be as descript as possible post all effected email accounts they are blocked from public view there but you will need to ask a new question, outlook.com confirm secondary email address - Microsoft Community
I do notice you have a drop down arrow next to the listed email account what is the other listings ?
Do you know that email address or access to it ?
There is a link in the answer to contact Microsoft for assistance
My Computer
At a glance
Win-7-Pro64bit 7-H-Prem-64biti7-5930K 2nd i9-9940x both water blocked VRM'...Trident-z 3200C14 2nd Trident-z 3600C16EVGA 1080ti ftw3 2nd Titan Xp both water blocked
Computer type
PC/Desktop
Computer Manufacturer/Model Number
Custom assembled by me :}
OS
Win-7-Pro64bit 7-H-Prem-64bit
CPU
i7-5930K 2nd i9-9940x both water blocked VRM's too
2nd ASUS X299 Apex/Intel i9-9940x with Custom water loop/7H-Prem-x64/Corsair 450D case/Ram Trident-z 3600C16 4x8gb / Samsung970Evo plus 500gb SSD/Dual ssd EZ swap evo/PSU EVGA SuperNova 1200w-P2 80+Platinum/GPU Titan Xp /8-ML-140 on push-pull on 2-280GTX rads