Apps installed on my devices via Xcode all result in "Unable to verify app" when trying to open them.
https://ppq.apple.com seems to have a broken SSL cert chain, confirmed on multiple devices on multiple different networks. I see SSL cert errors in the Xcode device console logs right before I try to open my apps, so these seem to be related.
openssl s_client -connect ppq.apple.com:443 -servername ppq.apple.com -showcerts 2>&1 | grep -E "Verify return code|s:CN|i:CN"
0 s:CN=ppq.apple.com, O=Apple Inc., ST=California, C=US
i:CN=Apple Server Authentication CA, OU=Certification Authority, O=Apple Inc., C=US
1 s:CN=Apple Server Authentication CA, OU=Certification Authority, O=Apple In
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