Authentication to Paper account is working; Live is failing

I refreshed the api keys for both PAPER and LIVE. I have them stored as needed. I’m working in Golang and authenticating for PAPER is working fine. Authenticating for LIVE gives error message:
2021/06/19 13:54:32 goapp.go:145: initAlpaca-- Something wrong with alpaca GetAccount access key verification failed : request is unauthorized (generate APCA-API-KEY-ID and APCA-API-ACCESS-SECRET-KEY from dashboard and include in HTTP header) (Code = 40110000)
What changed about authentication since December 2020? That’s when I was last actively trading on the platform without issue.