Powershell encryption error: Recovery policy configured for this system contains invalid recovery certificate

I'm trying to encrypt files using powershell, using this command:

(Get-Item -Path MyFile.txt).Encrypt()

But I'm getting this error:

(Get-Item -Path MyFile.txt).Encrypt()
Exception calling "Encrypt" with "0" argument(s): "Recovery policy configured for this system contains invalid recovery certificate.
"
At line:2 char:1
+ (Get-Item -Path MyFile.txt).Encrypt()
+ ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ + CategoryInfo : NotSpecified: (:) [], MethodInvocationException + FullyQualifiedErrorId : IOException

What is causing this error? Why do I need a recovery certificate?

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