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Activation error 20515020

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I have purchased a Multi Device License for 10 devices for several years. I have installed Eset products and activated them on several devices (PC and Android) without problems but I was trying to activate it on another Android device today and i got this error message: Activation error (20515020).

Please, tell me what I must do to fix this issue.

Thanks in advance.

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I was able to find only an Internet Security license which has been used on too many devices. Please add your license in the license manager at my.eset.com and remove the unused units.

As for a license for ESET Mobile Security, please contact the seller (ESET LLC). You have either purchased a wrong product (a license only for EIS) or something went wrong during the order that you didn't get a package with also an ESET Mobile Security license included.

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