App does not start if sandboxing is switched on

In 2025R1 using the Appstore-Connection I followed all the stuff Xavier provided thankfully. Xavier, thanks for that - great job!

My App is still not in the Appstore because it seemed too complicated for me yet. I gave it another try now - and ran into problems again. Switching sandboxing off I can create my app as before. If I switch it on, I get this:

I would not even know where to look for details about this error. Here are my settings:

and my “myEntitlements” file used in “User Entitlements”:

<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE plist PUBLIC "-//Apple//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd">
<plist version="1.0">
<dict>
	<key>com.apple.security.app-sandbox</key>
	<true/>
	<key>com.apple.security.files.user-selected.read-write</key>
	<true/>
	<key>com.apple.application-identifier</key>
	<string>66XXXX2332.com.phaenomind.phaenomind</string>
	<key>com.apple.developer.team-identifier</key>
	<string>66XXXX2332</string>
</dict>
</plist>

Btw. I would like to get access to ~/Library/Application Support/PhaenoMind and ~/Library/Logs/PhaenoMind and to the users Documents directory. I am not sure if I am on the right way here. Is this possible in the sandbox mode?

Thanks a lot for any comments in advance!

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