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Welcome to the LastPass Community. I would suggest you submit a case via our support page so that we can find out if this is related to your LastPass account since we do not have enough information as to what error you are seeing at the time of the purchase. Once you submit a case, please provide as much (no sensitive information) information as possible so that one of our dedicated agents can reach out to you and assist you properly. Please let us know if there is something else we can do for you.
Greetings!
Heyner | Customer Care