Umbraco 14 Update adding backoffice to the startup

Questions
1

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When I upgraded the umbraco package from 13.2.2 to 14.1.1 added some packages I am getting the error

The call is ambiguous between the following methods or properties: 'Umbraco.Extensions.UmbracoBuilderExtensions.AddBackOffice(Umbraco.Cms.Core.DependencyInjection.IUmbracoBuilder, System.Action<Microsoft.Extensions.DependencyInjection.IMvcBuilder>?)' and 'Umbraco.Extensions.UmbracoBuilderExtensions.AddBackOffice(Umbraco.Cms.Core.DependencyInjection.IUmbracoBuilder, System.Action<Microsoft.Extensions.DependencyInjection.IMvcBuilder>?)

It is having the two oveloads

This is a companion discussion topic for the original entry at https://our.umbraco.com/forum/114443-umbraco-14-update-adding-backoffice-to-the-startup
2

I had this issue going 13 > 17, it was due to two versions of Umbraco.Cms.Web.BackOffice being installed.

The package is no longer needed after v13, but some other packages may still reference/require it.

I was able (with CoPilots help) to find the package by running dotnet nuget why “[PROJECTNAME].csproj” Umbraco.Cms.Web.BackOffice .

It was uSync.Migrations in my case.