Did you enable 'link' as requesthandler in your deployment configuration?
See this topic for more info
You need to be able to append the attribute containing the identifier to the deeplink or it will not know which record to retrieve. If it will not allow you to enter the auto-number attribute, you need to create and populate a new attribute containing a unique identifier to use. You can populate this in a before commit microflow, perhaps to a value like 'BQ' + toString($IdRequest), then use that as your deeplink identifier.
Also note that in your url redirector screen capture above, you need to set the Target to a new page to avoid replacing the current page.
Hope this helps