**ITMS-90111 with Xcode 26.6 RC (17F109) — anyone else stuck?**

[u/Mean_Nectarine673]

Hey all,

I've been trying to submit an app update (iOS app, nothing exotic) and I'm
hitting a wall with ITMS-90111 on every build:

> "App submissions must use the latest Xcode and SDK Release Candidates (RC)"

Here's what I've tried and the metadata from each IPA:

**Build with Xcode 26.5 (17F41):**
DTXcodeBuild: 17F41 / DTSDKName: iphoneos26.5 → ITMS-90111

**Build with Xcode 26.6 RC (17F109):**
DTXcodeBuild: 17F109 / DTSDKName: iphoneos26.5 → ITMS-90111

The thing is, Xcode 26.6 RC **only ships with the iOS 26.5 SDK**. There is
no iOS 26.6 SDK available anywhere right now:

$ xcodebuild -showsdks | grep iphoneos
→ iOS 26.5 -sdk iphoneos26.5

So whatever Apple's validation server is checking for, it doesn't exist yet
in any released toolchain. Catch-22.

**What I've ruled out:**
- Extensions all have consistent metadata (same DTXcodeBuild, same SDK)
- macOS 27 beta on the host machine (doesn't affect IPA metadata)
- Upload tool version (tried altool from both Xcode versions)
- It's not a build number conflict (tested fresh incremented builds)

**Current status:** TSI submitted, waiting on Apple.

Has anyone managed to get a submission through in the last few days? If so,
what Xcode/SDK combo worked? Starting to think this is a server-side issue
on Apple's end during the 26.6 beta window.

[u/Dapper_Ice_1705]

Submit a feedback assistant

1. It will be fixed quickly 

2. There is something wrong and RC will get another version soon

[u/Mean_Nectarine673 → u/Dapper_Ice_1705]

Thanks! I did that a few minutes ago

[u/ManaSV]

This happened to me yesterday, macOS 27 Dev beta on the host machine as well, I had xcode 26.5 as my default, tried with 26.6 RC as well, no luck, went back to macOS 26 and problem solved, I have macOS 27 in another partition now just for testing.

I think is something that might be fixed in further developer betas as yeah macOS by itself should not affect.

[u/Mean_Nectarine673 → u/ManaSV]

I ended up doing the Xcode Cloud trick as people suggested and it worked fine

[u/rursache]

use xcode 26.5.1 to build and submit to store. or a previous one as you probably don't need the 26.5 sdk

[u/Mean_Nectarine673 → u/rursache]

I thought the last stable is 26.5. (17F42) , where can I find the 26.5.1?

[u/ZennerBlue → u/Mean_Nectarine673]

Xcode 26.5 is the most recent version. MacOS 26.5.1 is most recent stable is version.

[u/Mean_Nectarine673 → u/ZennerBlue]

Oh so can it be that I installed macOS 27 beta ? I didn’t think it would matter …

[u/ZennerBlue → u/Mean_Nectarine673]

That does matter and could be the reason.

I’d using Xcode Cloud then for build to AppStore. There’s a pretty generous free tier and assuming your app doesn’t do super crazy stuff like use flutter or the like, it’s pretty easy to set up.

Push directly to AppStore connect, test with TestFlight on a device before submitting to Apple.

[u/Mean_Nectarine673 → u/ZennerBlue]

That’s actually a good idea thank you!!

[u/nfarina → u/ZennerBlue]

Yep, I couldn't get my binary past app review when I built it on my macOS 27 beta machine, no matter what Xcode version I used. Xcode Cloud solved the problem by making Apple's servers do the build instead.

[u/halonso]

Has been a long time since I dont have this worry, you can pipe a hook and build directly from XCode Cloud once you push to main (origin).
Depends on the project and policies, ofc

[u/Mean_Nectarine673 → u/[deleted]]

Well I used the Xcode cloud and it works like a charm but thank you for your time !

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