gmail login in outlook

 if you are trying to login to outlook or any third party client make sure that you enable 2FA and then in my account generate a pass from APPS and access this option will come once you enable 2FA

if you are in gsuite make sure imap and POP are allowed in admin center of gsuite

https://accounts.google.com/ServiceLogin/identifier?service=accountsettings&passive=1209600&osid=1&continue=https%3A%2F%2Fmyaccount.google.com%2Fapppasswords&followup=https%3A%2F%2Fmyaccount.google.com%2Fapppasswords&rart=ANgoxcfR985arg8jsUGUGpxtekH-41Pd6krJ3-j-TQ_FenVpztHDJcD0lORa1rk8tjn2f5NFtjjo8XMu8IyCq6azPG0CtmSVSw&authuser=0&csig=AF-SEnbUwOaQl4HNSUSd%3A1527854153&flowName=GlifWebSignIn&flowEntry=AddSession

Manage access to less secure apps

You can allow users to turn on or off access to less secure apps or disable their ability to allow less secure apps.

1. Sign in to your Google Admin console.

   Sign in using an administrator account, not your current account bumkailashkumar@gmail.com
2. In the Admin console, go to  Menu  SecurityAccess and data controlLess secure apps.
3. To apply the setting to everyone, leave the top organizational unit selected. Otherwise, select a child organizational unit or a configuration group.
4. Select the setting for less secure apps:

   • Disable access to less secure apps  (Recommended)
     Users can’t turn on access to less secure apps.
     When you disable access to less secure apps while a less secure app has an open connection with a user account, the app will time out when it tries to refresh the connection. Timeout periods vary per app.

   • Allow users to manage their access to less secure apps
     Users can turn on or turn off access to less secure apps.
5. Click Save. If you configured a child organizational unit, you might be able to Inherit or Override a parent organizational unit's settings.

for single account

In the Account Window that opens up, click on the Security button on the left navigation column

iv) Scroll down and search for the option “Less secure app access”. If you have previously enabled the “2 Step Verification” option, then the “Less secure app access” will not be available. Therefore, you have to disable the “2 Step Verification” option

v) Now, scroll up to the “Signing in to Google” section. Then, click on the “2-Step Verification”button

Step 2: Change SMTP & other settings in your email client

Use the table below to update your client with the correct information. For help updating your settings, search your email client's Help Center for instructions on setting up IMAP.

Incoming Mail (IMAP) Server	imap.gmail.com Requires SSL: Yes Port: 993
Outgoing Mail (SMTP) Server	smtp.gmail.com Requires SSL: Yes Requires TLS: Yes (if available) Requires Authentication: Yes Port for SSL: 465 Port for TLS/STARTTLS: 587
Full Name or Display Name	Your name
Account Name, User name, or Email address	Your full email address
Password	Your Gmail password