Thank you azav ... solved my problem.
An excerpt from that link:
The current Apple Worldwide Developer Relations Certification Intermediate Certificate (intermediate certificate) is set to expire on February 7, 2023. The renewed certificate will be used to sign new software signing certificates issued after January 28, 2021 for the Apple Developer Programs.
https://developer.apple.com/support/expiration/
There is even a spot on the page to click which simply downloads the new AppleWWDRCAG3.cer file to your Mac for you to double-click (which installs it to Keychain). With the new cert in place (expiring Feb 19, 2030), the Apple Development cert I just created immediately became valid.
sseitz
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