Lets Troubleshoot
Heyy Robin
As you have already mentioned that it is not network issue.
This could be due to improper alignment between your device and the yahoo mail server.
Please do check if your username and password are correct
Logout and relogin into your yahoo account.
Also reinstall post uninstalling the yahoo app
Manually configure the settings in your yahoo mail account.
One of these troubleshoots carries your desired resolution.
Let us know if that works.
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