I am using the samples app (AppProject1), which I wish to use to send emails through gmail.

Unfortunately, when I try to send a email, I'm not even allowed to enter a password. I see the google login, and after I enter my email address, the next window says:

Sign in with Google

Couldn't sign you in

This browser or app may not be secure.

Try using a different browser. If you’re already using a supported browser, you can refresh your screen and try again to sign in.

What do I need to change? I see this in the email "If you got "This app isn't verified" information, please click "advanced" -> Go to ... for test.", but I don't see anywhere to click an "advanced" button or hyperlink.

For now, I am using the build in client id and secret in the sample app. Once I get the basics working, I'll apply for our own.

Best regards,

~ Cameron

Because Web Browser control is used for OAUTH,
Web browser control uses IE7 rendering mode by default,
it doesn't support latest Google Web Login Page.

You should install IE 10/IE11 (recommended) or later version on your current machine,
and then add/mergin the following registry values to use IE 10 mode.

"AppProject1.exe" is your executable file name.
In current project, it is "AppProject1.exe"
If you debug it in VS, please also add "AppProject1.vshost.exe"

Windows Registry Editor Version 5.00
[HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Internet Explorer\Main\FeatureControl\FEATURE_BROWSER_EMULATION]
"AppProject1.exe"=dword:00002AF9
"AppProject1.vshost.exe"=dword:00002AF9

[HKEY_LOCAL_MACHINE\SOFTWARE\WOW6432Node\Microsoft\Internet Explorer\Main\FeatureControl\FEATURE_BROWSER_EMULATION]
"AppProject1.exe"=dword:00002AF9
"AppProject1.vshost.exe"=dword:00002AF9

Appendix - Web Browser Control Mode:

11001 (0x2AF9) Internet Explorer 11. Webpages are displayed in IE11 Standards mode, regardless of the !DOCTYPE directive.
11000 (0x2AF8) Internet Explorer 11. Webpages containing standards-based !DOCTYPE directives are displayed in IE11 mode.
10001 (0x2711) Internet Explorer 10. Webpages are displayed in IE10 Standards mode, regardless of the !DOCTYPE directive.
10000 (0x2710) Internet Explorer 10. Webpages containing standards-based !DOCTYPE directives are displayed in IE10 mode.
9999 (0x270F) Internet Explorer 9. Webpages are displayed in IE9 Standards mode, regardless of the !DOCTYPE directive.
9000 (0x2328) Internet Explorer 9. Webpages containing standards-based !DOCTYPE directives are displayed in IE9 mode.
8888 (0x22B8) Webpages are displayed in IE8 Standards mode, regardless of the !DOCTYPE directive.
8000 (0x1F40) Webpages containing standards-based !DOCTYPE directives are displayed in IE8 mode.
7000 (0x1B58) Webpages containing standards-based !DOCTYPE directives are displayed in IE7 Standards mode. This mode is kind of pointless since it's the default.