I'm trying to code sign a *rd party app. I've gotten errors like "this identity can no...

GetHuman934714's customer service issue with Apple Developer Support from July 2018

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The issue in GetHuman934714's own words
I'm trying to code sign a *rd party app. I've gotten errors like "this identity can not be used for signing code" and "no identity found" in terminal, which makes me think it has something to do with the certificate settings. I made my certificate(s) in Apple Developer and they are in Keychain Access. The status is "success*good" and they have a blue plus sign on them. All the settings are on "always" and anywhere so I don't think it's a trust thing. Any new insight is appreciated. Thanks!
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Apple Developer Support

Customer service issue
Reported by GetHuman934714
Jul 31st, 2018 - 9 mons ago
I have an issue with Apple Developer Support too
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Seen by 14 customers so far
Similar issue to 25 others
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GetHuman934714 started working on this issue
Jul 31st, 2018 4:22pm
GetHuman934714 indicated the issue is not fixed yet.
Jul 31st, 2018 5:33pm
GetHuman934714 indicated the issue is not fixed yet.
Aug 1st, 2018 5:22pm
GetHuman934714 indicated the issue is not fixed yet.
Aug 1st, 2018 5:23pm
GetHuman934714 indicated the issue is not fixed yet.
Aug 3rd, 2018 5:26pm
GetHuman934714 indicated the issue is not fixed yet.
Aug 6th, 2018 2:13pm