csharp
namespace Application.Core.OpeningHours.BankHolidays;

public class BankHolidayImportTask
{
    private readonly IUmbracoContextFactory _umbracoContextFactory;
    private readonly IContentService _contentService;
    private readonly IServerMessenger _serverMessenger;
    private readonly IServiceProvider _serviceProvider;

    public BankHolidayImportTask(
        IUmbracoContextFactory umbracoContextFactory,
        IContentService contentService,
        IServiceProvider serviceProvider,
        IServerMessenger serverMessenger)
    {
        _umbracoContextFactory = umbracoContextFactory;
        _contentService = contentService;
        _serverMessenger = serverMessenger;
        _serviceProvider = serviceProvider;
    }

    public async Task ImportBankHolidays()
    {
        using var backgroundScope = new BackgroundScope(_serverMessenger);
        using var _ = _umbracoContextFactory.EnsureUmbracoContext();
        using var serviceScope = _serviceProvider.CreateScope();

        var query = serviceScope.ServiceProvider.GetRequiredService<IPublishedContentQuery>();
        var rootNode = query.ContentAtRoot().FirstOrDefault();

        if (rootNode == null)
            return;

        // Do something with ContentService
        var content = _contentService.GetById(rootNode.Id);
        content.SetValue("phoneNumber", DateTime.Now.ToString());
        _contentService.SaveAndPublish(content);
    }

    public class BackgroundScope : IDisposable
    {
        private readonly IServerMessenger _serverMessenger;

        public BackgroundScope(IServerMessenger serverMessenger)
        {
            _serverMessenger = serverMessenger;
        }

        public void Dispose()
        {
            if (_serverMessenger is BatchedDatabaseServerMessenger batchedDatabaseServerMessenger)
            {
                batchedDatabaseServerMessenger.SendMessages();
            }
        }
    }
}

SourceContext Umbraco.Cms.Infrastructure.HostedServices.QueuedHostedService
ThreadId 9
WorkItem workItem
System.AggregateException: One or more errors occurred. (No AmbientContext was found.)
 ---> System.InvalidOperationException: No AmbientContext was found.
   at Umbraco.Cms.Infrastructure.Scoping.AmbientScopeContextStack.Pop()
   at Umbraco.Cms.Infrastructure.Scoping.ScopeProvider.PopAmbientScopeContext()
   at Umbraco.Cms.Infrastructure.Scoping.Scope.<>c__DisplayClass100_0.<RobustExit>g__HandleScopeContext|2()
   at Umbraco.Cms.Infrastructure.Scoping.Scope.TryFinally(Action[] actions)
   --- End of inner exception stack trace ---
   at Umbraco.Cms.Infrastructure.Scoping.Scope.TryFinally(Action[] actions)
   at Umbraco.Cms.Infrastructure.Scoping.Scope.RobustExit(Boolean completed, Boolean onException)
   at Umbraco.Cms.Infrastructure.Scoping.Scope.DisposeLastScope()
   at Umbraco.Cms.Infrastructure.Scoping.Scope.Dispose()
   at Umbraco.Cms.Infrastructure.Examine.ExamineUmbracoIndexingHandler.DeferedReIndexForContent.<>c__DisplayClass6_0.<Execute>b__0(CancellationToken cancellationToken)
   at Umbraco.Cms.Infrastructure.HostedServices.QueuedHostedService.BackgroundProcessing(CancellationToken stoppingToken)

System.AggregateException: One or more errors occurred. (No AmbientContext was found.)
 ---> System.InvalidOperationException: No AmbientContext was found.
   at Umbraco.Cms.Infrastructure.Scoping.AmbientScopeContextStack.Pop()
   at Umbraco.Cms.Infrastructure.Scoping.ScopeProvider.PopAmbientScopeContext()
   at Umbraco.Cms.Infrastructure.Scoping.Scope.<>c__DisplayClass100_0.<RobustExit>g__HandleScopeContext|2()
   at Umbraco.Cms.Infrastructure.Scoping.Scope.TryFinally(Action[] actions)
   --- End of inner exception stack trace ---
   at Umbraco.Cms.Infrastructure.Scoping.Scope.TryFinally(Action[] actions)
   at Umbraco.Cms.Infrastructure.Scoping.Scope.RobustExit(Boolean completed, Boolean onException)
   at Umbraco.Cms.Infrastructure.Scoping.Scope.DisposeLastScope()
   at Umbraco.Cms.Infrastructure.Scoping.Scope.Dispose()
   at Umbraco.Cms.Infrastructure.Examine.ExamineUmbracoIndexingHandler.DeferedReIndexForContent.<>c__DisplayClass6_0.<Execute>b__0(CancellationToken cancellationToken)
   at Umbraco.Cms.Infrastructure.HostedServices.QueuedHostedService.BackgroundProcessing(CancellationToken stoppingToken)

System.InvalidOperationException: Cannot save a non-current version.
   at Umbraco.Cms.Infrastructure.Persistence.Repositories.Implement.DocumentRepository.PersistUpdatedItem(IContent entity)
   at Umbraco.Cms.Core.Cache.DefaultRepositoryCachePolicy`2.Update(TEntity entity, Action`1 persistUpdated)
   at Umbraco.Cms.Infrastructure.Persistence.Repositories.Implement.EntityRepositoryBase`2.Save(TEntity entity)
   at Umbraco.Cms.Core.Services.ContentService.<>c__DisplayClass64_0.<CommitDocumentChangesInternal>g__SaveDocument|2(IContent c)
   at Umbraco.Cms.Core.Services.ContentService.CommitDocumentChangesInternal(ICoreScope scope, IContent content, EventMessages eventMessages, IReadOnlyCollection`1 allLangs, IDictionary`2 notificationState, Int32 userId, Boolean branchOne, Boolean branchRoot)
   at Umbraco.Cms.Core.Services.ContentService.SaveAndPublish(IContent content, String culture, Int32 userId)
   at v100test.BankHolidayImportTask.ImportBankHolidays() in E:\Dev\Temp\v100test\HangfireScheduler.cs:line 56

// Extra check whether Hangfire is enabled otherwise it will fail as the composer still tries to register the jobs