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Each separate VPN connection requires a seperate user account in the FRITZ!Box.
A feasible scenario could be to set up one user for the owner and one for service personnel.
The access for service personnel can then be switched on/off independently from the owner access. Configuration steps 1)
to 6) have to be repeated corespondingly.
1)
In the FRITZ!Box user interface click on "System".
2)
Go to "FRITZ!Box User" → “User“.