csr unknown error -2,147,409,850

Im trying to generate a CSR certificate but the assistent throw a unknown error with the code

-2,147,409,850

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Reaching out across space and time because I hit the same issue, and this was the only result on the whole internet I came across.

My situation: I'm building a PWA, and packaging that as an iOS app using PWABuilder. As part of this (step #3 "Create a Certificate Signing Request (CSR)" from their iOS guide), I'm supposed to create a CSR to upload the the portal and them import into the keychain, but that process isn't working.

I've tried a few workarounds I saw for other, similar Keychain Access errors on the internet, e.g. selecting "Let me specify key pair information", but the error remains the same, screenshot below: