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