I am sorry to hear this.
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Unfortunately, if you do not know the password for an AxCrypt-encrypted file you cannot open it, even if you can sign in to the account. This is by design, it’s just this situation that AxCrypt is made for and it works like this even if you actually are the original owner of the file.
Please check the FAQ at https://www.axcrypt.net/support/faq/ for more information.