I am able to change my asmodee.net username without difficulty. However, even after doing so, my username in the Squad Builder (web and app) still appears unchanged. I've cleared browser data and uninstalled/reinstalled the app. Logging into the Squad Builder with different asmodee.net accounts does show different account names, but always only the username which was current at the time I first logged into the Squad Builder with each asmodee.net account. In other words, it seems that when you first log into the Squad Builder with an asmodee.net account, the Squad Builder "remembers" that username for that account and never checks it again. Functioning as intended or is this an oversight?

Bumping this because i have the same "problem".

I can't imagine this is intended. Might be fixed in future versions, because it would be pretty pointless if you were stuck to a username without a proper warning.