I've seen similar bug reports about this same kind of issue, but all the solutions from those resolved reports have not helped for me. The issue according to the launcher is that there is a "missing/invalid yggdrasil public key"

Issue has gone on for 4+ months, and affects all minecraft accounts on this specific PC, not just one. PC meets the requirements to run the game, so that's not the cause of the problem. The PC runs on Windows 10.

Solutions tried so far that have failed:

Restarting computer

Updating Java

Reinstalling launcher + trying alternate launchers

Reinstalling minecraft

Installing any available windows updates

Updating video card drivers

Not really sure how to describe this one- I did that thing where you press the windows button+r and paste something (powershell -command "Start-Process notepad $env:windir\system32\drivers\etc\hosts" -Verb runas) and delete all entries containing the word "mojang" if there are any. (mine had none of those)

Crash Report:

---- Minecraft Crash Report -------- Minecraft Crash Report ----// My bad.
Time: 8/17/21, 10:59 PMDescription: Initializing game
java.lang.Error: Missing/invalid yggdrasil public key! at com.mojang.authlib.yggdrasil.YggdrasilMinecraftSessionService.<init>(YggdrasilMinecraftSessionService.java:84) at com.mojang.authlib.yggdrasil.YggdrasilAuthenticationService.createMinecraftSessionService(YggdrasilAuthenticationService.java:89) at dvp.<init>(SourceFile:428) at net.minecraft.client.main.Main.main(SourceFile:179)

A detailed walkthrough of the error, its code path and all known details is as follows:---------------------------------------------------------------------------------------
– Head --Thread: Render threadStacktrace: at com.mojang.authlib.yggdrasil.YggdrasilMinecraftSessionService.<init>(YggdrasilMinecraftSessionService.java:84) at com.mojang.authlib.yggdrasil.YggdrasilAuthenticationService.createMinecraftSessionService(YggdrasilAuthenticationService.java:89) at dvp.<init>(SourceFile:428)
– Initialization --Details:Stacktrace: at net.minecraft.client.main.Main.main(SourceFile:179)
– System Details --Details: Minecraft Version: 1.17.1 Minecraft Version ID: 93084182d6d24e1fb306a02e8fafb48a Operating System: Windows 10 (amd64) version 10.0 Java Version: 16.0.1, Microsoft Java VM Version: OpenJDK 64-Bit Server VM (mixed mode), Microsoft Memory: 458448272 bytes (437 MiB) / 905969664 bytes (864 MiB) up to 2147483648 bytes (2048 MiB) CPUs: 6 JVM Flags: 9 total; -XX:HeapDumpPath=MojangTricksIntelDriversForPerformance_javaw.exe_minecraft.exe.heapdump -Xss1M -Xmx2G -XX:+UnlockExperimentalVMOptions -XX:+UseG1GC -XX:G1NewSizePercent=20 -XX:G1ReservePercent=20 -XX:MaxGCPauseMillis=50 -XX:G1HeapRegionSize=32M Launched Version: 1.17.1 Backend library: LWJGL version 3.2.2 SNAPSHOT Backend API: NO CONTEXT Window size: <not initialized> GL Caps: Using framebuffer using OpenGL 3.2 GL debug messages: <disabled> Using VBOs: Yes Is Modded: Probably not. Jar signature remains and client brand is untouched. Type: Client (map_client.txt) CPU: <unknown>