This is the most ridiculous error I've ever seen in my life.
If you share a sheet with someone but make a mistake while writing their email, "smart"sheets won't let you send it to the corrected email address. It will autocorrect to the email where you made a mistake.
How could you make a mistake so simple and didn't anticipate that this would be a trouble?
It's so frustrating and ridiculous. I'm telling my company to stop using this app