No attack mails when gmail is removed from Google account.
I've posted about this issue back in 2019, the issue iself is way older then that. This is very much still a thing.
If you have a google account and delete the GMAIL service from it attack notifications will NOT be sent to the newly associated e-mail address even though Ingress itself is aware of the change by virtue of your new e-mail address showing up in your profile.
No amount of disconnecting and reconnecting google accounts and whatnot fixes this.
I realize this not particularly high priority but back then support told me this was a known issue. Possibly only with legacy accounts?
Maybe it's time this gets a fix. Seems like low hanging fruit to me.