Hi @MojangSupport I can't change my e-mail address anymore, because I don't have access to my old e-mail address. I also don't have the transaction id anymore.
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Replying to @einfachdaniele
Please send us an email at help.minecraft.net/hc/en-us/… and we will assist. Remember to attach your Transaction ID. ^SP

Oct 10, 2020 · 2:46 PM UTC

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Replying to @MojangSupport
As described above, I no longer have my transactions id :(
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