This app was mentioned in 4 comments, with an average of 1.25 upvotes
Possibly something is misconfigured, or something about that application is not compatible with yahoo services.
The "stock" email apps that come on phones are often flaky and unreliable.
My advice would be to install the actual Yahoo email app and use that instead:
https://play.google.com/store/apps/details?id=com.yahoo.mobile.client.android.mail&hl=en
I really like Yahoo Mail!. I have tried a lot of email clients and this one is the in my opinion the best. The layout with the bottom bar is so good. It has nice themes, and looks very good overall. You can create folders, organize email into them. There is no fancy pointless "AI" features and other nonsense. It's just a really well laid out, designed app with good core functionality which is absent in a lot of those super smart email apps (such as something as simple as being able to create a folder). The only thing I do not like is the transition animation, the complete lack of it, when you tap on an email to open it and then back to the main list.
Please don't use Yahoo! Mail. It's the worst email provider on Earth.
That said, you probably aren't ready to leave Yahoo this instant. https://play.google.com/store/apps/details?id=com.yahoo.mobile.client.android.mail&hl=en_US Go ahead and install their mail app while you work on a plan to get rid of that awful, awful Yahoo account.