Welcome to the forum @smn.mro
If I might try a different angle on this,
Sometimes log errors are hard to interpret, especially if only one line is shown. Fortunately you got more, so I’ll offer another possibility for what is going on. This might take some back-and-forth for further debug.
MainOperation: Test
Verifications: [
Key: duplicati-20190819T120839Z.dlist.zip.aes
Value: [
Key: Error
Value: Hash mismatch on file "C:\Users\simon\AppData\Local\Temp\dup-eb859c3a-735f-49f4-a0b6-7155a2c52ecd", recorded hash: JzSkWV8CRTY+DCGEOC2tb/6QG/7pqVb+VZoWZfiGhfg=, actual hash /HZqoSHwDYYDLdCnsRK8cwLqZutQy5ul1dG2ZNhfzgQ=
],
and
possibly go together. The mentioned test involves a download, and the download gets checked for correct hash. If file is not what was expected, a retry is done. As a long shot, do you have any upload or download speed throttling? There have been some issues fixed, and OneDrive is one backend known to be affected.
Failed to process file … due to HashMismatchException error says more about this idea, including fix link. Whether or not that fix will fix your case is TBD, and far less likely if you are not using any sort of throttling.
EDIT:
Regardless of cause, you can try downloading the file giving the complaint, directly from the OneDrive UI. You can use any zip program to try your luck opening it, if it’s unencrypted. If encrypted, AES Crypt can do decryption (or fail trying, if file is actually bad). If you prefer Duplicati’s CLI tool, please try SharpAESCrypt.