404Page not found!when i try to type in plus key and send invoice via email

It's nice to have you here, @info534,

Have you tried using an alternate browser or a private window when sending these invoices? If not, I suggest doing that first. I need to know if this is caused by a known web page problem. Try these keyboard shortcuts depending on your browser:

• Google Chrome: Ctrl + Shift + N
• Mozilla Firefox: Ctrl + Shift + P
• Internet Explorer: Ctrl + Shift + P
• Safari: Command + Shift + N

If you can successfully send the sales transactions, go back to the affected browser and clear its browsing history. Once the data clogs up in the cache, it can cause potential performance issues in QuickBooks Online and other pages.

You can find the steps here: How do I clear my browser cache and temporary Internet files?

Please let me know if you need further help with this or anything about QuickBooks. I'll be right here to help, just leave a comment below. Have a nice day!