Currently, PowerShell Universal does not allow uploading or storing certificates as variables. This forces administrators to store certificates externally and inject them at runtime, which adds complexity and increases the risk of inconsistent deployments.
I use Azure KeyVault for this currently, any certificates stored in the keyvault can be imported into PSU in the same way as normal secrets, I use this for example to connect to PnPOnline using a certificate thats base64 encoded.
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