gmail password confirmed, but [AUTHENTICATIONFAILED] Invalid credentials

In gmail I enabled using “less-secure” apps.

I successfully logged into gmail via a new browser using the same pastes (username and password) I had pasted into Postie settings.
I used the full email address (including @gmail.com) in the Postie settings.

I tested the connection:
Postie connection: sockets
Postie protocol: imap-ssl
Postie server: imap.gmail.com
Postie port: 993
Unable to connect. The server said: IMAP – Could not connect to IMAP server imap.gmail.com on port 993. Array
(
[0] => A0002 NO [AUTHENTICATIONFAILED] Invalid credentials (Failure)
)