On 09/09/2020 09:09, No Name wrote:

I tracked it down to a Windows 10 upgrade switching off SMB 1.0 and
enabling SMB 2.0 and SMB 3.0.

The Fritzbox in question had an upgrade available for the latest (later)
version of SAMBA support on the very day that the OP originally asked
about connecting a USB drive to the Fritzbox. I assume that the OP
downloaded and installed the upgrade (or the automatic upgrade was
selected in the Fritzbox menu)

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