I am so sorry to hear that you are having an issue accessing your Yahoo mail on the Microsoft Edge browser. I actually tried my Yahoo mail on the Microsoft Edge browser I have on my desktop computer and it works fine without any issues. Please follow the troubleshooting steps listed below to sort this out: 1. More @Wikipedia
Hover over any link to get a description of the article. Please note that search keywords are sometimes hidden within the full article and don't appear in the description or title.