I was able to create a build, After doing the " fix. I tried submitting it and got the same Invalid Signature error. Sending over a .rar to Stephen right now.
@Bpop, yup, no need for new certs or provisions.
-Pete
@Bpop, ya, I wasn’t expecting it to fix your issue, just hopeful.
@Bpop, ok, I have some new information. I was able to use my mac to try to validate the code signature. I now see why it is failing as the requirement rules are not set up correctly for you IPA. However, they should be set up the same way for every IPA. TLDR, I have a new avenue to look at for fixing this for you.
-Pete
Ok, this is a really stupid and cliched bug. I have an off by one error when calculating the length of strings for alignment. Since your certificate name is exactly 52 characters and the alignment is based on 4, I am adding an extra 4 bytes to the requirements which is being interpreted as a False and so it considers your signature as always invalid. I should have something for you try in the next 20-30 minutes.
-Pete
That’s great! I’m getting a bit busy so probably can’t try until later tonight. But sounds super promising :). :Excited:
It worked! Yeay Thank you Pete! 
Hi Pete. Hope you can help me out. I’m having a similar-ish issue with an iOS submission. Made a post about my issue here
I have also just downloaded and installed the above Apple Certificate you mentioned and uploaded to iTunes Connect. But still no joy! Please help! 
Cheers