Hello! I have the same issue of having vanilla minecraft work on a domain and roaming profiles while forge does not, I have very similar (if not the same) things written in the logs too. I'm trying to run Forge 1.16.4 build 35.1.4 (the recommended build).
Log
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[07Mar2021 18:43:28.270] [main/INFO] [cpw.mods.modlauncher.Launcher/MODLAUNCHER]: ModLauncher running: args [--username, ImaginedFantasy, --version, 1.16.4-forge-35.1.4, --gameDir, \\DC\Users$\user\AppData\Roaming\.minecraft, --assetsDir, \\DC\Users$\user\AppData\Roaming\.minecraft\assets, --assetIndex, 1.16, --uuid, 3b2326585ed24f90b3d481e1d14a1486, --accessToken, ????????, --userType, mojang, --versionType, release, --launchTarget, fmlclient, --fml.forgeVersion, 35.1.4, --fml.mcVersion, 1.16.4, --fml.forgeGroup, net.minecraftforge, --fml.mcpVersion, 20201102.104115]
[07Mar2021 18:43:28.280] [main/INFO] [cpw.mods.modlauncher.Launcher/MODLAUNCHER]: ModLauncher 8.0.6+85+master.325de55 starting: java version 1.8.0_51 by Oracle Corporation
[07Mar2021 18:43:28.299] [main/WARN] [cpw.mods.modlauncher.SecureJarHandler/]: LEGACY JDK DETECTED, SECURED JAR HANDLING DISABLED
[07Mar2021 18:43:28.679] [main/INFO] [net.minecraftforge.fml.loading.FixSSL/CORE]: Added Lets Encrypt root certificates as additional trust
[07Mar2021 18:43:28.759] [main/INFO] [mixin/]: SpongePowered MIXIN Subsystem Version=0.8.2 Source=file://DC/Users$/user/AppData/Roaming/.minecraft/libraries/org/spongepowered/mixin/0.8.2/mixin-0.8.2.jar Service=ModLauncher Env=CLIENT
[07Mar2021 18:43:34.787] [main/INFO] [STDERR/]: [java.lang.ThreadGroup:uncaughtException:1052]: java.lang.IllegalArgumentException: URI has an authority component
[07Mar2021 18:43:34.787] [main/INFO] [STDERR/]: [java.lang.ThreadGroup:uncaughtException:1052]: at java.io.File.<init>(File.java:423)
[07Mar2021 18:43:34.787] [main/INFO] [STDERR/]: [java.lang.ThreadGroup:uncaughtException:1052]: at org.spongepowered.asm.launch.platform.container.ContainerHandleURI.<init>(ContainerHandleURI.java:57)
[07Mar2021 18:43:34.788] [main/INFO] [STDERR/]: [java.lang.ThreadGroup:uncaughtException:1052]: at org.spongepowered.asm.launch.platform.container.ContainerHandleModLauncher$Resource.<init>(ContainerHandleModLauncher.java:45)
[07Mar2021 18:43:34.788] [main/INFO] [STDERR/]: [java.lang.ThreadGroup:uncaughtException:1052]: at org.spongepowered.asm.launch.platform.container.ContainerHandleModLauncher.addResource(ContainerHandleModLauncher.java:76)
[07Mar2021 18:43:34.788] [main/INFO] [STDERR/]: [java.lang.ThreadGroup:uncaughtException:1052]: at org.spongepowered.asm.launch.platform.container.ContainerHandleModLauncher.addResources(ContainerHandleModLauncher.java:86)
[07Mar2021 18:43:34.789] [main/INFO] [STDERR/]: [java.lang.ThreadGroup:uncaughtException:1052]: at org.spongepowered.asm.launch.MixinLaunchPlugin.addResources(MixinLaunchPlugin.java:181)
[07Mar2021 18:43:34.789] [main/INFO] [STDERR/]: [java.lang.ThreadGroup:uncaughtException:1052]: at cpw.mods.modlauncher.LaunchPluginHandler.lambda$offerScanResultsToPlugins$7(LaunchPluginHandler.java:78)
[07Mar2021 18:43:34.789] [main/INFO] [STDERR/]: [java.lang.ThreadGroup:uncaughtException:1052]: at cpw.mods.modlauncher.LaunchPluginHandler$$Lambda$400/1822630059.accept(Unknown Source)
[07Mar2021 18:43:34.790] [main/INFO] [STDERR/]: [java.lang.ThreadGroup:uncaughtException:1052]: at java.util.HashMap.forEach(HashMap.java:1280)
[07Mar2021 18:43:34.790] [main/INFO] [STDERR/]: [java.lang.ThreadGroup:uncaughtException:1052]: at cpw.mods.modlauncher.LaunchPluginHandler.offerScanResultsToPlugins(LaunchPluginHandler.java:78)
[07Mar2021 18:43:34.791] [main/INFO] [STDERR/]: [java.lang.ThreadGroup:uncaughtException:1052]: at cpw.mods.modlauncher.Launcher.run(Launcher.java:77)
[07Mar2021 18:43:34.791] [main/INFO] [STDERR/]: [java.lang.ThreadGroup:uncaughtException:1052]: at cpw.mods.modlauncher.Launcher.main(Launcher.java:66)
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How did you get it to work? Please let me know
Oh! and I should mention, I don't understand a lick of code, so I could be using terms wrong in this post and might need particularly clear or descriptive directions in a response.
Thanks!