Thanks. What's the meaning of OAuth and TFA? Is what I am thinking correct, apps that does not require the password to be entered are shown there but others are not is correct?
I use a couple of them, Outlook, Bluemail, Litemail etc. I use them for different Gmail accounts. Have checked in all but nothing.
Afraid I'm oversimplifying, but here goes:
OAuth - An authentication mechanism where the app authenticates itself to a service (Google, in this case) using access tokens. You typically "permit" access to the app during the intial setup and don't need to use your regular password at all. Likewise, you may "revoke" access to the app from the service. More here -
https://en.wikipedia.org/wiki/OAuth
TFA (Two-factor authentication) - Where you typically use the password (an app-specific password, in case of Google) *and* a secondary means of authentication (via a authenticator app, or OTP sent to your phone, etc.). Google considers this a legacy method (OAuth is their preferred method, for obvious reasons) and requires that you have TFA enabled, in order to use app-specific passwords, to authenticate.
So, if you do not use passwords in your apps to authenticate, you almost certainly are using OAuth authentication. Which means, you won't have needed to use app-specific passwords and will find this section empty.
I know for certain that Outlook supports OAuth, and just verified that Bluemail does too. Which means you should find your apps listed in your Google account settings ->
Security (
https://myaccount.google.com/security?gar=1) or more specifically,
here (
https://myaccount.google.com/permissions?gar=1). I would think there's certainly something wrong, if you use OAuth and still don't find your apps here, since this is the primary means of revoking access.