For those having issues... This solves some situations. Don't downvote just because it doesn't solve this specific OP--there are dozens of side cases.

So... many users are seeing an integration issue because the Azure DevOps Office Integration in of itself is not enough. Most folks using it have Visual Studio. However, those that don't may pull the Visual Studio Team Explorer 2022 for instance. Depending upon how you use it, you may need a CAL, but normally for "Stakeholder" access (users who require limited, basic access) may not need a CAL.

This installation will provide the other "bits" need to enable the Office addin to work for Excel and Project. This worked when all of the other steps seen throughout stackoverflow didn't.