How to mock a db access with unitOfWork and repository (.NET Core 6)

In a PUT route, I have an utility method where we put the business logic (so we can call the method and not the route when we need to do the job that route does).

I don't understand how can I fake the data connection.

In the route, I call

using (var unitOfWork = new UnitOfWork(IP, DbName, UserId, IdAzienda))
{
    GroupEvents ret = UtilityOffPrenotazioni.UpdatePrenotazione(event, unitOfWork, group, eventId, userId, mapper, UserId, agencyId);
}

Inside the function i do some validation and other things, including some db operations like

Tblageeventi ev = new Tblageeventi();
ev = unitOfWork.TblageeventiRepo.Read(eventId, userId)
...
...
ev = unitOfWork.TblageeventiRepo.Update(ev);
eventRet = mapper.Map<Tblageeventi, EventiGruppo>(ev);

unitOfWork.TblageeventiRepo.Delete(new Tblageeventi()
{
    UserId = userId,
    EventId = eventId
});

In the test method, I have something like this

var retEvent = A.Fake<Tblageeventi_extended>();
var ev = A.Fake<Tblageeventi>();
using (var unitOfWork = A.Fake<UnitOfWork>((x => x.WithArgumentsForConstructor(() => new UnitOfWork(_ip, _dbName, _userId, _agencyId, "", 5432)))))
{            
    A.CallTo(() => unitOfWork.TblageeventiRepo.Read(eventId, userId)).Returns(retEvent);
    A.CallTo(() => unitOfWork.TblageeventiRepo.Update(ageeventi, "")).Returns(ev);

    // Act
 
    UtilityOffPrenotazioni.UpdatePrenotazione(groupEvents, unitOfWork, groups, eventId, idUtente, _mapper, _userId, _agencyId);
}

The error says

Object 'SxMultitenantDAL.Repos.TblageeventiRepository' of type SxMultitenantDAL.Repos.TblageeventiRepository is not recognized as a fake object

I don't find a way to fake TblageeventiRepo (its type is TblageeventiRepository).

For more information, read signature inside the TblageeventiRepository class ->

public Tblageeventi_extended Read(int eventId, int userId).

Is there a way for mocking this? I am starting now studying testing topic, so I don't know even if the way I wrote (organize) is correct.

Thank you