Any rate limiting applied to the SSID? Both 2.4 and 5 GHz are working? What frequency is the phone connecting to? Download ookla app (speedtest.net) and perform a speed test and TutuApp
compare it with the laptop.
It could also be a DNS issue. The youtube app Lucky Patcher
does not use your normal dns, but it connects to youtube servers directly. I know this because OpenDNS will block youtube by not Kodi
resolving youtube.com, but the apps on phones continue to work fine...
Thank you @Victor Cenac
My issue has been solved