NEW UEFN 40.00 update - start session error - at least 1 failed remote validation

General Issues and Bug Reporting
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1

Summary

when i click on the new start session, after the new UEFN 40.00 release, I receive this error “at least 1 failed remote validation”

here some correlated logs:
[2026.03.19-15.22.13:913][635]LogOnline: Warning: OSS: Async task ‘FOnlineAsyncTaskMcpFindSingleSession bWasSuccessful: 0’ failed in 0.176915 seconds
[2026.03.19-15.22.13:999][635]LogFort: Warning: Plugin ‘VerseQuery’ was hotfixed to be disabled, but was not found. Ignored.
[2026.03.19-15.22.14:002][636]LogHotfixManager: Warning: Only 259 of 279 assets were successfully patched from ‘AssetHotfix’ section in the Game .ini file. The patched assets will be forced to remain loaded. Any assets that failed to patch may be left in an invalid state! Failure may occur due to the plugin not being installed and mounted.
[2026.03.19-15.22.18:356][865]LogNet: Warning: Channel name will be serialized as a string: LiveTrace
[2026.03.19-15.22.18:356][865]LogNet: Warning: Channel name will be serialized as a string: ValkyrieBeacon
[2026.03.19-15.22.19:166][907]LogEntitlementComponent: Warning: [3dd9] Still waiting on entitlement results. Not calling complete callback.
[2026.03.19-15.22.19:359][919]LogEntitlementComponent: Warning: [3dd9] Still waiting on entitlement results. Not calling complete callback.
[2026.03.19-15.22.19:424][923]LogEntitlementComponent: Warning: [3dd9] Still waiting on entitlement results. Not calling complete callback.
[2026.03.19-15.22.36:989][976]LogValkyrie: Error: FlowStep_ResolveSessionCandidates(): Candidate module [e49d8901-4602-d8d3-0c57-e7a5df081fb5] failed validation with error: [epicgames.com.errors.cook.non_zero_exit]

Please select what you are reporting on:

Unreal Editor for Fortnite

What Type of Bug are you experiencing?

Matchmaking

Steps to Reproduce

when i click on the new start session, after the new UEFN 40.00 release, I receive this error “at least 1 failed remote validation”

Expected Result

new game session starting

Observed Result

i see the popup message “at least 1 failed remove validation”

Platform(s)

pc

Additional Notes

[2026.03.19-15.22.13:913][635]LogOnline: Warning: OSS: Async task ‘FOnlineAsyncTaskMcpFindSingleSession bWasSuccessful: 0’ failed in 0.176915 seconds
[2026.03.19-15.22.13:999][635]LogFort: Warning: Plugin ‘VerseQuery’ was hotfixed to be disabled, but was not found. Ignored.
[2026.03.19-15.22.14:002][636]LogHotfixManager: Warning: Only 259 of 279 assets were successfully patched from ‘AssetHotfix’ section in the Game .ini file. The patched assets will be forced to remain loaded. Any assets that failed to patch may be left in an invalid state! Failure may occur due to the plugin not being installed and mounted.
[2026.03.19-15.22.18:356][865]LogNet: Warning: Channel name will be serialized as a string: LiveTrace
[2026.03.19-15.22.18:356][865]LogNet: Warning: Channel name will be serialized as a string: ValkyrieBeacon
[2026.03.19-15.22.19:166][907]LogEntitlementComponent: Warning: [3dd9] Still waiting on entitlement results. Not calling complete callback.
[2026.03.19-15.22.19:359][919]LogEntitlementComponent: Warning: [3dd9] Still waiting on entitlement results. Not calling complete callback.
[2026.03.19-15.22.19:424][923]LogEntitlementComponent: Warning: [3dd9] Still waiting on entitlement results. Not calling complete callback.
[2026.03.19-15.22.36:989][976]LogValkyrie: Error: FlowStep_ResolveSessionCandidates(): Candidate module [e49d8901-4602-d8d3-0c57-e7a5df081fb5] failed validation with error: [epicgames.com.errors.cook.non_zero_exit]

2

LogValkyrie: Error: FlowStep_ResolveSessionCandidates(): Candidate module [ff53f254-4c47-987d-93e4-0ea02ffdbf58] failed validation with error: [epicgames.com.errors.cook.non_zero_exit]

LogEOSSDK: LogEOSRTC: TickTracker Ticks have been delayed. TimePeriod=[10.017066s] TickIntervalThreshold=[40ms] MaxTickInterval=[210ms] MaxExecutionTime=[1ms] TicksCount=[50] ExpectedTicksCount=[301]
LogEOSSDK: LogEOSRTC: TickTracker Ticks have been delayed. TimePeriod=[10.011011s] TickIntervalThreshold=[40ms] MaxTickInterval=[210ms] MaxExecutionTime=[1ms] TicksCount=[50] ExpectedTicksCount=[301]
LogValkyrieScratchManifest: Display: Profile Begin SyncProject.PruneScratchSpaceFiles.ScratchManifest.LoadFromCloud.FetchManifestLink.FetchDssLinks
LogValkyrieScratchManifest: Display: Profile Begin SyncProject.ScratchManifest.McpDssGetFileLinks
LogValkyrieScratchManifest: Display: Profile SyncProject.ScratchManifest.McpDssGetFileLinks, 0.132087
LogValkyrieScratchManifest: Display: Profile SyncProject.PruneScratchSpaceFiles.ScratchManifest.LoadFromCloud.FetchManifestLink.FetchDssLinks, 0.132110
LogEOSSDK: LogEOSRTC: TickTracker Ticks have been delayed. TimePeriod=[10.007257s] TickIntervalThreshold=[40ms] MaxTickInterval=[209ms] MaxExecutionTime=[1ms] TicksCount=[50] ExpectedTicksCount=[301]
LogEOSSDK: LogEOSRTC: TickTracker Ticks have been delayed. TimePeriod=[10.008625s] TickIntervalThreshold=[40ms] MaxTickInterval=[208ms] MaxExecutionTime=[1ms] TicksCount=[50] ExpectedTicksCount=[301]
LogValkyrie: FlowStep_ResolveSessionCandidates()
LogValkyrie: Error: FlowStep_ResolveSessionCandidates(): Candidate module [ff53f254-4c47-987d-93e4-0ea02ffdbf58] failed validation with error: [epicgames.com.errors.cook.non_zero_exit]

LogValkyrieFortniteEditorLiveEdit: Verbose: FValkyrieFortniteEditorLiveEdit::UploadEnd H:/ftm_/ftm.uefnproject, Failed
LogValkyrieFortniteEditorLiveEdit: Verbose: FValkyrieFortniteEditorLiveEdit::SetUploadRequired 1
LogValkyrieFortniteEditorLiveEdit: Verbose: FValkyrieFortniteEditorLiveEdit::SetTrackingUploadRequired 0
LogValkyrieRequestManagerEditor: OnProjectSyncCompleted: H:/ftm_/ftm.uefnproject, Failed
LogValkyrieEditorAnalytics: Displaying Stats for Flow
LogValkyrieEditorAnalytics: =========================
LogValkyrieEditorAnalytics: Flow=Play
LogValkyrieEditorAnalytics:  PlayFlow=127.960
LogValkyrieEditorAnalytics:  ↳ PrepareProjectSourceData=19.678
LogValkyrieEditorAnalytics:    ↳ UploadCookDownload=127.960
LogValkyrieEditorAnalytics:      ↳ ValidationSessionInitializeContext=1.596
LogValkyrieEditorAnalytics:      ↳ ValidationSessionRunLocalValidation=18.033
LogValkyrieEditorAnalytics:        ↳ SyncWithContentService=0.820
LogValkyrieEditorAnalytics:        ↳ UpdateProjectMetadata=0.252
LogValkyrieEditorAnalytics:        ↳ InitSyncModules=1.442
LogValkyrieEditorAnalytics:        ↳ StageProjectModules=1.559
LogValkyrieEditorAnalytics:        ↳ GatherFilesForValidation=0.006
LogValkyrieEditorAnalytics:        ↳ DownloadPublishedVerseFiles=0.000
LogValkyrieEditorAnalytics:        ↳ ValidateProject=7.644
LogValkyrieEditorAnalytics:    ↳ FindServer=5.551
LogValkyrieEditorAnalytics:      ↳ MatchmakingToServer=3.901
LogValkyrieEditorAnalytics:        ↳ ValidationSessionUploadCandidateSourceFiles=86.144
LogValkyrieEditorAnalytics:    ↳ ValidationSessionCreateValidationSession=0.282
LogValkyrieEditorAnalytics:    ↳ ValidationSessionCreateModuleVersions=21.655
LogValkyrieEditorAnalytics:      ↳ ValidationSessionPruneScratchSpace=6.421
LogValkyrieEditorAnalytics:    ↳ ValidationSessionResolveSessionCandidates=0.172
LogValkyrieEditorAnalytics: =================================
1 Like
3

LogValkyrieSyncModule: Error: Failed to upload file with request [https://valkyrie-dss-live.s3.amazonaws.com/valkyrie/scratch/7c28a87862994ebc81590bb34890a5af/8aed22eda231e5aaacf1b766d9a20b1357f2b79262edf4911e0bcc3cd5cb2ee1?X-Amz-Algorithm=AWS4-HMAC-SHA256&X-Amz-Date=20260319T150024Z&X-Amz-SignedHeaders=host&X-Amz-Expires=1800&X-Amz-Credential=AKIAJZXGHJ4JPCHOJJWA%2F20260319%2Fus-east-1%2Fs3%2Faws4_request&X-Amz-Signature=2daafe6e99d8bce818a2feba9a13a64b4af865c33255a950acd6ece8276f6c00\]. Retrying in [3.503098] seconds…
LogHttp: Warning: 000001B76C48F500: request failed, libcurl error: 28 (Timeout was reached)

i belive all these validate erros is all about Amazon AWS

4

hi
i solved the problem..

i reinstalled everything from epic game launcher to fortnite and uefn

now all is ok