Please try the following steps to allow an exception to the Reolink app in the Google Fi APP.
Go to the "Google fi app"- privacy/security then "protect online activity" & "show details".
Then manage advanced settings.
Shut off exemptions allowed.
Click add an exception.
Find the Reolink app.

I'm having the exact same problem. Pixel 5 on android 13. I've tried 4.31.0.4 and 4.30.1.1 with the same results. I manage three different NVR's across three different networks. I can't access any of them while connected to cellular. However Wifi works on all three and it doesn't even matter what WIFI i'm connected to they all work. I'm using Google Fi as my network provider and really hope this can be figured out. I'm a huge fan of reolink and have spent 1000's on NVR's and POE cameras.

Please try the following steps to allow an exception to the Reolink app in the Google Fi APP.
Go to the "Google fi app"- privacy/security then "protect online activity" & "show details".
Then manage advanced settings.
Shut off exemptions allowed.
Click add an exception.
Find the Reolink app.

I'm having the exact same problem. Pixel 5 on android 13. I've tried 4.31.0.4 and 4.30.1.1 with the same results. I manage three different NVR's across three different networks. I can't access any of them while connected to cellular. However Wifi works on all three and it doesn't even matter what WIFI i'm connected to they all work. I'm using Google Fi as my network provider and really hope this can be figured out. I'm a huge fan of reolink and have spent 1000's on NVR's and POE cameras.