if you tried upload App to iTunes Connect resp. AppStore and get the following error:
Failed to locate or generate matching signing assets
Xcode attempted to locate or generate matching signing assets and failed to do so because of the following issues.
Missing iOS Distribution signing identity for … Xcode can request one for you.
This is because WWDR Intermediate certificate expired on Feb 14 now you have expired certificates in you login and system.
Step1 : Delete “Apple Worldwide Developer Relations Certificate Authority Intermediate certificate” from system and login.
Step2 : Download new certificate WWDR Intermediate Certificate .
Step3 : Install the new certificate.
Step 4: Quit XCode and reopen it.