Gmail login problem

I have a Gmail account with 2 step verification. I try to connect to it with Em. after I login successfully, Em asks me to log in again. and it’s going on again and again. what is the problem, and how can i solve it. thanks 

Hello Farhad,
can you please screenshot the login window?

Regards,
Olivia

Hello Farhad,
I see, can you test if you can login into your Gmail account in Chrome and then try again in eM Client?

Regards,
Olivia

yes i use my gmail every day. on chrome. as i told you, i could log in and passed my 2 steps verification correctly and allowed permission to Em, but it keeps asking to log in. yet i’m already managing about 10 email accounts, and only i have problem with gmail. 

hello,
still no solution for this problem?

Hello Farhad,
have you tried logging into eM Client with an app password?

Regards,
Olivia