Check if username (your gmail id) and password are correct and you are able to login on https://www.google.com/gmail/

If Step 1 is okay, then try to open Less secure app access setting and turn this to OFF

1. https://myaccount.google.com/lesssecureapps (In case your email is personal account)
2. If your email is created by Google Admin (Gsuite), then you need to contact your Administrator and ask then to turn this setting to OFF for your account
   1. <a href=https://admin.google.com/>Sign in</a> to your Google Admin console
   2. From the Admin console Home page, go to Security > Less 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:
      1. 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.
   

https://support.google.com/accounts/answer/6010255?hl=en#zippy=%2Cif-less-secure-app-access-is-on-for-your-account%2Cif-less-secure-app-access-is-off-for-your-account

https://support.google.com/a/answer/6260879?hl=en