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Let me explain more clearly really three accounts involved . My USA premium account works perfectly. And, I have two friends I'm helping here in Guatemala. The first friend probably will want a Guatemalan account, so I'll make the change you recommend above. The second friends has a USA account. Will friend #2 be able to get ad-supported free stream in Guatemala via his USA account?
If the "second friend" is using Spotify free, then it will work "abroad" in Guatemala for 14 days before loosing access. After that period, changing country here to Guatemala is all they should need to do. Once they are back in the US, they should be able to change back (just do the reverse) easily.