It has been forever I tried to get ToS to use the dedicated AMD gpu. Now I found out why and finally did it.
AMD Radeon Crimson driver does not work for ToS.
Not sure why but the auto profile/manual profile in the Radeon Crimson does not work. I’m not sure if it will work with Catalyst alone but for sure it will work if you add the profile to both Catalyst and Crimson.
Note* The Auto detect thingy in AMD official website will only detect your Crimson software. If you are missing Catalyst, you will need to go to your product driver page manually to download it.