Recently, New-PACertificate has been failing on two of my different machines, one of them fails with this kind of error in Import-PAConfig (with either LE_STAGE or LE_PROD servers):

On a second machine, the staging certificate is created without problems but attempting to create a production certificate, this different error in Invoke-ACME occurs:

Both errors started happening seemingly for no reason on the newest version of Posh-ACME at the moment (4.26.0)