Player #numbers are no longer shown in log.
It's now impossible to add someone unless you know them IRL because player #numbers are no longer shown in logs. I've disabled and re-enabled detailed logging and it's still not available.
This essentially means Arena is no longer a social game - I can't ask someone for their decklist, or even just say good game.
This has only happened in the last few days, clearly a result of something being pushed through in the patch - an unannounced change like this is a massive problem.
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Dude#19647 commented
Besides not being able to add a player to your friend list, this change also has an impact on many 3rd party trackers [e.g. MTGArena.Pro, MTG Assistant], which stopped working because of the new username format.