So I have tried to debug this a bit, but I am not making much headway.

Apparently the error is:

chains.sh: #718: RealCerts: Verifying certificate(s)  PayPalEE.cert with flags -d AllDB -pp      -o OID.2.16.840.1.114412.1.1  - FAILED
chains.sh: Verifying certificate(s)  BrAirWaysBadSig.cert with flags -d AllDB -pp      
vfychain -d AllDB -pp -vv       /tmp/guix-build-nss-3.36.1.drv-0/nss-3.36.1/nss/tests/libpkix/certs/BrAirWaysBadSig.cert 
Chain is bad!
PROBLEM WITH THE CERT CHAIN:
CERT 0. BrAirWaysBadSig :
  ERROR -8181: Peer's Certificate has expired.
Returned value is 1, expected result is fail


My Guix version is —> guix (GNU Guix) 0.15.0-1.4876bc8

I have attached some files for you info.  Not sure if the attachments will work or not, but here goes.

Click to Download
 <https://www.icloud.com/attachment/?u=https%3A%2F%2Fcvws.icloud-content.com%2FB%2FAZB9KuYEFA_VO1ETxRLEKt3Xazx1AZ1uJK13eE0hak2ZNsmoqEC9XZrk%2F%24%7Bf%7D%3Fo%3DAhl2rhIXPpFhMKUABounUzn176OyELEyzjD-UVhgCtGI%26v%3D1%26x%3D3%26a%3DB4HePG0n1SgmK4mvO8CI1NdcWSsQA3acRwEACAHIAP8wLRTxA7bzRg%26e%3D1543890549%26k%3D%24%7Buk%7D%26fl%3D%26r%3D913AD543-8C4F-4EA6-9EE6-5C1B7EED7F23-1%26ckc%3Dcom.apple.largeattachment%26ckz%3D600D35C7-6A17-4E32-B9B2-0B62C0980B97%26p%3D10%26s%3D3vDY-LTphXb4VYXhhf8-l0um24o&uk=ocif6YkvkoV_0clmfkyX0w&f=environment-variables&sz=4585>environment-variables
5 KB
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 <https://www.icloud.com/attachment/?u=https%3A%2F%2Fcvws.icloud-content.com%2FB%2FAeU7xSarmGitmCM3EnfyAuEho834AW3Ad2cxOErP1NdzzbNpbg2JeKcA%2F%24%7Bf%7D%3Fo%3DAlElYDCxFWxbnLojD8Wx6WxVfOFB_dkaWXIhFEq8WPeS%26v%3D1%26x%3D3%26a%3DB0kPVQmyeoKMx1PHBOOixv1kDZUWA3acRwEACAHIAP8AQdaaA7bzRg%26e%3D1543890548%26k%3D%24%7Buk%7D%26fl%3D%26r%3D9651E7C3-22E9-4B03-AC33-4BBAFB842C5B-1%26ckc%3Dcom.apple.largeattachment%26ckz%3D600D35C7-6A17-4E32-B9B2-0B62C0980B97%26p%3D10%26s%3Dlq02ipNAkniQRHFrN3o1p-fxi0A&uk=_QDD5DN2WuTEjpzr1-92YQ&f=output.log&sz=40066010>output.log
40.1 MB
Click to Download
 <https://www.icloud.com/attachment/?u=https%3A%2F%2Fcvws.icloud-content.com%2FB%2FAcmWAWtikwgoHlbdB4_I1hmP5fsaATJ2s7GQ8HdqSxPF3-6ojy1FBUa5%2F%24%7Bf%7D%3Fo%3DAlVL76E-zp4amezO8jXqNzrte38FyKgsQlR903zumCxf%26v%3D1%26x%3D3%26a%3DB2_OCHDmVbljPcB4GInZHn1KbijtA3acRwEACAHIAP9b6axuA7bzRg%26e%3D1543890548%26k%3D%24%7Buk%7D%26fl%3D%26r%3D61F23A46-1D98-49D5-B046-14BB1064956D-1%26ckc%3Dcom.apple.largeattachment%26ckz%3D600D35C7-6A17-4E32-B9B2-0B62C0980B97%26p%3D10%26s%3DNh80pqE54xvoxgHJI0mLupXdN1o&uk=xuc6Zek6upSJ-7mOS0RzYg&f=2gwwhy92zviwl9k74r9vz9ccmgyw91cn-nss-3.36.1.drv&sz=40955704>2gwwhy92zviwl9k74r9vz9ccmgyw91cn-nss-3.36.1.drv
41 MB