Hi, if you are using one single network (1 SSID) to connect both 2.4Ghz and 5Ghz devices or you don’t see or use 2 separate networks at home, you must be using combined 2.4/5Ghz network in one SSID (WiFi network name) and this is not recommended.
Get into the router and confirm/discard if the networks (2.4Ghz and 5Ghz) are separate or combined in one