D365 F&O Tier 1 Update Failure Step 25 AOSService

When upgrading a tier 1 environment you could receive the following error:

GlobalUpdate script for service model: AOSService on machine

This usually means an issue with the DB sync, however, the log zip file doesn't always contain a file indicating the error.  Here are some steps to fix this issue:

1. Ensure VS 2022 is fully upgraded.
1. If you had to upgrade VS 2022, uninstall D365 F&O extension
2. Re-install extension from K:\DeployablePackages\                                    [ID]\DevToolsService\Scripts\Microsoft.Dynamics.Framework.Tools.Installer.17.0
2. Full compile of ALL modules
3. DB Sync
4. Restart environment
5. 'Resume' upgrade

D365 F&O Service Update failure DevToolsService

Recently when upgrading tier 1, cloud hosted, environments from 10.0.41 to 10.0.42,43, or 44 I received the following error:
 
Update script for service model: DevToolsService on machine

On some of my environments I would receive an error indicating it couldn't find VS 2022 and others that had VS 2022 it was another error.  

In order to get past this I would do the following:

1. If missing VS 2022, install it.
1. If it is already installed, update it.
2. Remove the D365 F&O extension if it is installed.
2. Install D365 F&O extension from K:\DeployablePackages\[ID]\DevToolsService\Scripts\Microsoft.Dynamics.Framework.Tools.Installer.17.0
3. In the same 'Scripts' folder, run the powershell command '.\AutoUpdateDevToolsService.ps1'
4. If that is successfull, copy and make a duplicate of that command.
5. Delete all code in the original .ps1 file and then resume your service update.