Problem

After upgrading to the the 7.7 March21 or May21 releases, a JWT Sign filter aborts with an "unknown key type" error.

Resolution

A bug introduced in the March21 release caused the JWT Sign filter to stop accepting key aliases and to only accept certificate objects for the key. This was fixed in the August21 release. Affected customers can work around this issue by using a Find Certificate filter to look up the key alias first, then use the variable with the certificate object outputted by the Find Certificate filter in the JWT Sign filter.