My Samsung T7 is not working with my iPhone and Macbook

1. Problem: I cannot open the password and view the device on the iPhone that I encrypted with Samsung Magician. I could not find the Samsung Magician application in the app store. What should I do? 2. Problem: I need to switch from full security to reduced security to use Samsung Magician. I’m a bit concerned about security. Is this really a big problem? Can someone who knows explain what this setting is? That way, I can understand the security risk and act accordingly. Most importantly, why does Samsung want me to do this and do I have any other alternatives? https://preview.redd.it/6x761zq8v3ce1.png?width=1000&format=png&auto=webp&s=bd3645820a32480e3282f00e9ceb1a8033743e19