K9 does not sync with gmail

I added my gmail account but the email list does not sync or show notification on new emails. How I can fix that ?

I have Android 10

what K9 release are you using?

under: “settings/[account/]fetching mail/” what are your poll and push settings? gmail supports push, which is probably the better choice.

are you using OAuth 2.0 or an app password for authentication?