Microsoft 365 App Install failures 0x0000426A

Question

I am in the process of moving our Microsoft 365 installers to a single unified installer. Previously we had separated Teams from the base M365 install when Microsoft announced they were doing the same. However, since end of 2024 when Microsoft stated they are re-bundling Teams with the installer (aware that licenses are still separate) and the fact that PatchMyPC is not supporting New Teams, we are looking to move back to a single office installer for all M365 apps.

In my POC I have excluded the group from the PMP installer of Teams classic as well as the Intune Microsoft 365 installer that was pushing the base suite of apps. I created a new M365 installer with the base apps + teams (6 apps total). When deploying to the POC group I am seeing a high number of failures with error code 0x0000426A. A couple threads I've found mention moving to the semi-annual channel to fix, but my initial testing didn't seem to resolve this. I've screenshot the configuration I am using for the new installer and hoping someone has had some luck in getting this type of issue resolved in their environment. It does seem like, for some devices at least, it will sit at the error for a few days and then eventually flip over to "installed".

However, I don't want to roll this out to our 1100 devices and have a large number of users see their office apps disappear or become corrupted.

Answer 1

@RPA-EndpointEngineer, Thanks for posting in Q&A. For the error code 0x0000426A, it is often related to conflicts with existing Office installations or update channels. From your description, I notice we have already changed update channel but the issue still persists.

To clarify the issue, we can firstly create a group and only add some testing devices to look into the issue:

Then remove other Microsoft 365 app assignment and only leave one. Confirm all the requirements are met with "Before you start" in the following link:

https://learn.microsoft.com/en-us/mem/intune/apps/apps-add-office365#before-you-start

If all are already met, but the issue still persists, pleaser follow the Deployment details and troubleshooting part to look into the issue.

https://learn.microsoft.com/en-us/mem/intune/apps/apps-add-office365#deployment-details

If there's any update, feel free to let su know.

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