I get an error trying to install MacOS Big Sur on my external SSD

I bought a Samsung T7 to run macOS on it because my internal HD was getting too slow. So what I firstly did was I installed the latest MacOS on my HD. Then I restarted my Mac while holding down command+R. Then I clicked reinstalling MacOS Big Sur in the menu and selected my SSD. After like 10 minutes or so of it showing it’s installing I get an error saying “There was an error preparing for installation. Run this app again.”

Did anybody else have this problem and knows how to fix it?

submitted by /u/Delicious_Hand_72
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