Bought new iPhone 13 online from T-M, and was able to use online T-M help to transfer data from my old iPhone, but online T-M help for e-sim activation is very confusing.  Finally went to local T-M store where they took care of e-sim activation quickly.  I was told that getting a unique QR code to scan with your new iPhone to link e-sim (and iPhone SEID to my T-M account can ONLY be done by calling T-M or an in person T-M store visit, NOT online.  This is NOT clear in online T-M help and I wasted 2 hours trying to figure out how to get a QR code online.  Please clarify the (too numerous) places where this is discussed in online T-M help.

Thanks