mail won't show one of my 4 gmail accounts
I have transferred my data/setting from my old macbook to my new macbook pro (OS X Capitan V 10.11) using cable and everything went smooth except that i miss one of my gmail account on Mail (Version 9). Note that I have the other 4 gmail accounts and both professional ones).
When i try to "add count" i see "account already exists". Indeed when i go to Mail/accounts i can see all of them nicely. Also logged in (put the password) on the "faulty" gmail but without success. Also restarted Mail afterwards to check. also read the comments and cannot see something similar (1out of 4 gmail)
can someone please help me
MacBook Pro with Retina display, OS X El Capitan (10.11)