Avoid current user to duplicate the registration

[vadiraj1100]

Hi All,

I have a sp list which will be updated by the form using canvas app.

Each entry will have Team including 5 team members. eg  mem1@g.com , mem2@g.com  .... mem5@g.com

Now if any of the user from this entry comes and try to register it should check the current logged in user with the entry and if the user exists in the entry he should be navigated to "Already Registered" page , Else he should be navigated to "Home Page"

where he can continue to register as usual.

I have tried On start of App

If(IsBlank(LookUp('List name', User().Email ='Team Member 1 - Mail'.Email)),Navigate('Already Registered',ScreenTransition.Fade),Navigate('Home Screen',ScreenTransition.None))

Not sure what is going wrong here but the new user is also prompted to Already registered page. Even if he is not part of any entry.

[vadiraj1100]

Hey @Drrickryp ,

It worked like a charm Thanks a lot, Anyways if i want to compare all the Team members in the List with the current user so that no one from the team who are part of a team cannot be in any other team should i use Or function ? or AND function 

Set(UserEmail,User().Email); Collect(listname,'ListName'); If(!IsBlank(LookUp(listname, 'Team Member 1 - Employee Mail'.Email =UserEmail Or 'Team Member 2 - Employee Mail'.Email =UserEmail)),Navigate('Already Registered',ScreenTransition.Fade),Navigate('Home Screen',ScreenTransition.None))

does it make sense.