Not able to access all mail accounts

Not able to access all mail accounts

Hi, issue started a couple of days ago.

I have three email accounts I access through the zoho interface, zoho, gmail and another account both through IMAP. A few days ago the gmail account wasn't visible on the email page, just the other two. Yet through the dashboard widget I can see all three mail accounts on the drop down and can select all three.

Any thoughts on why I can only access 2 accounts?

Thanks