Mail app not syncing with web gmail

laurlaur27 Said:

"Mail app not syncing with web gmail: [...]the last 3 days I checked my email on my phone, deleted a bunch of messages and read them all, but then when I log into gmail on my desktop web browser, I have 60 unread messages from the last 3 days. I can delete or open mail from web gmail and those changes are reflected in my ios mail app, but not vis versa. Can someone please help me with this?"

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Try a New App Password:

One each device, try creating and using a new App Password. Your App Password may need to resync - something typical after update installations. You would log in using that password, rather than your email password. Here Is the site for gmail: Sign in with App Passwords - Google Account Help - Google

I also had this issue, but wasn't using an App Password.

What solved it for me was deleting the Account from Mail and then re-adding it. Now I'm back to normal again.