To do this you will it's possible to add the new Public Key as an additional Key as is shown in the following screenshot.
Click on Add Additional Key, and paste the new key in the additional textbox that gets created, leaving the current Public Key in place. This older key can be removed at a future date, when the External Identity Provider is using the new Public Key.
By doing this way, the Mule Platform will accept both Public Keys, which will prevent a lockout situation due to authorization failures.
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