Situation
QBO(Buick Book Desktop) has a problem that can't send an invoice to client. E-mail provider is G-Mail.
Solution
Google has change their Security policy so you should add app password in Google account. First, You can access your google account and visit security option. Add app and generate app password. copy the generated app password and paste QBO E-mail setup password.
Play Video about Tax & Accounting Professipnal
