Warning: the minecraft launcher PolyMC has been hijacked by its main dev, with them having removed all permissions from all other devs on the team, followed by them nuking the code of conduct with the name of the commit being "reclaim PolyMC from the leftoids". There is a significant chance that there could be an update to the launcher soon that adds malicious code. Do not use this launcher for the time being.

Revoke its access to your microsoft account here:
https://account.live.com/consent/Manage