I described to you how the subscritpion plan works.
see on the right panel ? you need to sign in.
If it doesn’t work, you need to sign out, then on sketchup.com in your profile, you can deauthorise everything, and come back and sign is in both.
a subscription comes with 2 simultaneous activations. it can be on 2 machines. or it can be 2 versions on one machine. at the same time.