I'm sorry about the issue. Do you use the app called Email or Gmail for gmail email?
If you have a windows or mac computer, is your gmail currently working fine on the computer?
Please reply at the box below. Thank you.
Open the Gmail app icon on the phone, does it work? Thank you.
There is no incognito in that app. Do you mean when you use gmail in Chrome in incognito mode on the phone, then it has issue? How about when in normal mode in chrome on the phone? Please let me know. Thank you.