Originally Posted by
fumje
From my experiences, it seems that the system is coded to allow access within 24h of the first segment on an itinerary including a Polaris segment, but some agents like to read over the BP before scanning and may intercede to avoid letting you in.
I've never had this happen at any UC or Polaris Lounge when using the mobile BP - just take the phone and hover it over the scanner, I've never had an agent try and take my phone to look at the boarding pass. A paper boarding pass might be a different story, so to the OP, caveat emptor.