I think that Microsoft is now an AI company. My guess is that they used AI to generate the code to fix this problem. The goal they give to their AI engine is to maximize company profits. The AI result was a nop. :-(
BTW, I'm a software engineer. This really is an easy problem to fix. All other email clients do this very simple task very nicely. Somebody, or AI, made a mistake when they added the capability to add gmail and yahoo accounts. I remember a time when my students (I was a computer science professor for 23 years) wanted to work for Microsoft because they hired only the best.