X509Certificate2 on consumption tier

When loading a certificate in an expression, the following works in developer+ tiers, however not on Consumption tier.

X509Certificate2 certificate = new X509Certificate2(Convert.FromBase64String((string)context.Variables["keyVaultCertBase64"]), (string)null);

Haven't been able to find in the docs. Am I missing something? Any suggestions greatly appreciated'

Start by investigating whether X509Certificate2 construction from a Base64 value is supported in Azure API Management policy expressions on the Consumption tier. Compare the reported behavior with the developer and higher tiers and check the relevant APIM documentation; the issue does not name repository files or tests, and done would require a confirmed explanation or documented resolution.

Written by the indexing model from the issue text.