Hi there, @vfuentes ...
It looks like you are maybe trying to set up the Redirect Tool LTI in your school's "test" environment (based on the URL that you have in the "URL Redirect" text field. Have you tried setting up the Redirect Tool LTI in your school's "production" environment (the environment that you normally sign in to from day to day)? For you, it looks like this would be:
http://acr.instructure.com/
If you have a "sandbox" course in your school's Canvas "production" environment, you could test this out...or just try adding it to a "live" course right away.
Keep us posted...thanks! Take care...be well.
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