Gmail notification issue on Xiaomi 15 Ultra

Hi everyone,

I'm currently having a strange issue with Gmail notifications. I have notifications enabled in the system settings, in the Gmail app itself, and all priority settings are configured correctly, but I still have to open Gmail manually to see new emails.

I've signed out of Gmail on all other devices so that my account is only logged in on my current phone. I also purchased additional Google Drive storage because I heard that could sometimes cause issues, but the problem still hasn't been resolved.

The situation is that some time ago I sent my Xiaomi 15 Ultra in for warranty repair because it failed, and the service center replaced the entire motherboard. When I got the phone back, I updated it to the latest software version, and since then, about a month ago, I've been having this issue.

Has anyone experienced something similar and found a solution?