Built a new version of an existing iOS app that supports both iPhone and iPad. iTunes Connect rejected upload because it did not contain a 167x167 app icon (83.5x83.5 @ 2x). Xojo build process creates all the other app icon sizes required.
I have filed a feature request that 167x167 app icon size be added to Xojo iOS build process. (<https://xojo.com/issue/44815>)
WORKAROUND FOR NOW:
I used Dave S’s iOSResourceMaker-2 to create the 167x167 app icon, named it appropriately (AppIcon167x167) and dragged it into the project. Now build the project. Show the Contents of the built project. Verify that the new app icon is included. Take a copy of the Info.plist file in Contents and using a text editor add the line AppIcon167x167 to the so you have the following in the file:
Save this edited Info.plist file somewhere in your project folder.
Now in Xojo Insert menu, Build Step sub-menu select Copy Files. This will create a CopyFiles1 in Contents. Drag this down to Build Settings, iOS between Build and Sign. Select CopyFiles1 and drag the Info.plist file you saved in your project folder into the IDE.
Now rebuild the project and the built project will be ready to submit to iTunes Connect. I just had my upload accepted.