Hey @davidw, you’re right about when the key is visible vs invisible. For the Data Freeze feature, we use a VPN to block traffic that is going over the cell network which would count towards your data bucket each month. Since traffic over WiFi doesn’t count towards your data usage, there’s no need for the VPN when you’re on WiFi, so we don’t turn it on yet which is why you don’t usually see the key icon on WiFi. Once WiFi is turned off, or has such a weak signal that your phone switches to sending traffic over cell, we turn the VPN on which triggers that key icon to show. While it is possible to see the key while connected to WiFi, it’s pretty unlikely because Android does a pretty good job at using WiFi whenever possible rather than cell.
Like others have said in this thread, it’s possible that the app you’re using is attempting to use its own VPN in which case the RW VPN for Data Freeze wouldn’t be active anymore since your phone can only have 1 active at a time. Have you had this issue with that particular app before? How long ago did you install it?