Getting a "certificate is not trusted" error for iOS Distribution Certificate

To support an older version of an iOS app, I needed to install Mojave with Xcode 9.

I create a CSR and from there generate an iOS Distribution certificate online, which I download and double click to install in Keychain. However, when viewing in Keychain, it shows in red "iPhone Distribution: CompanyName certificate is not trusted".

I'm not sure what I'm doing wrong as I follow the instructions to the T and have done this in the past with success.

NOTE: I tried this with Sierra as well and got the same issue. It only seems to work on Catalina, which doesn't help me because I need an older version of Xcode.
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johnjardin
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  • thanks man - this ate my brains for 3 hours to figure out

    —
    cloud_vtro
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Thanks Patel
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long-codelynx
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I love you Patel! ;)
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RonnyCSHARP
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U save my life, PATEL.
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liber
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THANK YOU PATEL!!!
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ianchouz
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God bless you and your family @patelgaurav4u_ios
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mdalicandro
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Yes. Many thanks. Days of head scratching. Apple, why so hard?
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rts165
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You the man patel
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brycehegedus
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Patel, You the man!!
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whatsonpubs
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@patelgaurav4u_ios Thanks a lot, you're a life saver
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AnkitJain36
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Thank you patelgaurav4u_ios!

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danielserva
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Patel, you're the best of the best!
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moraisandre
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Thank you patelgaurav4u_ios .
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kelvin tu
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10x, patelgaurav4u_ios. 
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mnaydenov
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Thanks patelgaurav4u_ios. Thanks for not very much, Apple.
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-swig-
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Patel, you are a legend mate. From NZ with many thanks ~

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KM_AppleDev
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