I seem to be having same issue. Yesterday, or day before, everything started up fine. Now, both of the servers I tried get stuck starting at the same point. The game or mods have not been updated or changed, so that should not be issue either.
Last lines from the log, what I can see from the console as it doesn’t allow scrolling up:
Loaded localization file #4 - 'localization_emotes' language: 'English'
Console: [Info : Unity Log] 05/21/2024 22:06:30: Loaded localization file #5 - 'localization_ashlands' language: 'English'
Loaded localization file #5 - 'localization_ashlands' language: 'English'
[Info :MaxPlayerCount] Patching for backend: Steamworks
Console: [Info : Unity Log] 05/21/2024 22:06:30: Console: [Info :MaxPlayerCount] Patching for backend: Steamworks
Console: [Info :MaxPlayerCount] Patching for backend: Steamworks
Console: [Info : Unity Log] 05/21/2024 22:06:30: Sending PlayFab login request (attempt 1)
Sending PlayFab login request (attempt 1)
Console: [Info : Unity Log] 05/21/2024 22:06:30: Login postponed until ID has been set.
Login postponed until ID has been set.
Console: [Info : Unity Log] The shader Hidden/Dof/DepthOfFieldHdr (UnityEngine.Shader) on effect Main Camera (UnityStandardAssets.ImageEffects.DepthOfField) is not supported on this platform!
The shader Hidden/Dof/DepthOfFieldHdr (UnityEngine.Shader) on effect Main Camera (UnityStandardAssets.ImageEffects.DepthOfField) is not supported on this platform!
Console: [Warning: Unity Log] The image effect Main Camera (UnityStandardAssets.ImageEffects.DepthOfField) has been disabled as it's not supported on the current platform.
The image effect Main Camera (UnityStandardAssets.ImageEffects.DepthOfField) has been disabled as it's not supported on the current platform.
Console: [Info : Unity Log] The shader Hidden/SunShaftsComposite (UnityEngine.Shader) on effect Main Camera (UnityStandardAssets.ImageEffects.SunShafts) is not supported on this platform!
The shader Hidden/SunShaftsComposite (UnityEngine.Shader) on effect Main Camera (UnityStandardAssets.ImageEffects.SunShafts) is not supported on this platform!
Console: [Info : Unity Log] The shader Hidden/SimpleClear (UnityEngine.Shader) on effect Main Camera (UnityStandardAssets.ImageEffects.SunShafts) is not supported on this platform!
The shader Hidden/SimpleClear (UnityEngine.Shader) on effect Main Camera (UnityStandardAssets.ImageEffects.SunShafts) is not supported on this platform!
Console: [Warning: Unity Log] The image effect Main Camera (UnityStandardAssets.ImageEffects.SunShafts) has been disabled as it's not supported on the current platform.
The image effect Main Camera (UnityStandardAssets.ImageEffects.SunShafts) has been disabled as it's not supported on the current platform.
Update: seems that the server started after about 2-3 hours. Way too long time to wait though, but issue may be tough to crack, as no changes outside of AMP updates have been done.