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So the app <b>mail and calendar</b> has access to the calendar under <b>Settings &gt;&nbsp;privacy &gt;&nbsp;calendar</b>?
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So the app mail and calendar has access to the calendar under Settings > privacy > calendar?

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And you verified that this is your current yahoo logon password? Try with a different mail account, then, please.
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And you verified that this is your current yahoo logon password? Try with a different mail account, then, please.

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That sounds very reasonable.
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Yeah!<br />
<br />
My previous comment not just applied to MS Outlook and will cover all kind of mail client apps.
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Yeah!

My previous comment not just applied to MS Outlook and will cover all kind of mail client apps.

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This was the issue - had to enable the two-step authentication and generate an app password. <br />
Thanks for the help!
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This was the issue - had to enable the two-step authentication and generate an app password.
Thanks for the help!

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Trying to sync a yahoo account to the Windows Mail App<br />
Here is a recap of what keeps happening:<br />
+Add Account&gt;Choose Yahoo Mail&gt;Type credentials&gt;Account settings successful<br />
Not sync'd yet&gt;choose sync <br />
Error&gt;Your account settings are not up to date&gt;Fix Account&gt;Askes for password&gt;type password again<br />
Attention required&gt; asks for password&gt;entered password<br />
&quot;We didn't find anything to show here&quot;<br />
<br />
Checked windows privacy settings to make sure under email that apps can access was turned on.
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Trying to sync a yahoo account to the Windows Mail App
Here is a recap of what keeps happening:
+Add Account>Choose Yahoo Mail>Type credentials>Account settings successful
Not sync'd yet>choose sync 
Error>Your account settings are not up to date>Fix Account>Askes for password>type password again
Attention required> asks for password>entered password
"We didn't find anything to show here"

Checked windows privacy settings to make sure under email that apps can access was turned on.

Windows 10 Mail Sync Error

Windows 10 is a personal computer operating system featuring the "universal application architecture" (UAP); apps can be designed to run across multiple devices with nearly identical code, including PCs, tablets, smartphones, embedded systems, Xbox One, Surface Hub and HoloLens. Windows 10 also includes a virtual desktop system, a window and desktop management feature called Task View, the Microsoft Edge web browser, support for fingerprint and face recognition login, voice-based search (Cortana), new security features for enterprise environments, and DirectX 12 and WDDM 2.0 to improve the operating system's graphics capabilities for games.

Windows 10

This topic area includes legacy versions of Windows prior to Windows 2000: Windows 3/3.1, Windows 95 and Windows 98, plus any other Windows-related versions including Windows Mobile.