Azure-quickstart-templates: Changing property 'linuxConfiguration.ssh.publicKeys' is not allowed

[R-and-all]

guacamole-rdp-vnc-gateway-existing-vnet https://github.com/Azure/azure-quickstart-templates/tree/master/guacamole-rdp-vnc-gateway-existing-vnet

Issue Details

Various errors in deployment. Worked through the username problem, however I can not get past the SSH key
Tried the one created in PuttyGen (publicKey for pasting into Open SSH authorized_keys file) and also the contents of the publickey saved via PuttyGen (file starts with ---- BEGIN SSH2 PUBLIC KEY ----
Comment: "rsa-key-guacamole". then the key data)

Activity Log Summary is:
Operation name
Create or Update Virtual Machine
Time stamp
Fri Dec 14 2018 16:35:33 GMT+0000 (Greenwich Mean Time)
Event initiated by
me @ myAzureEmailAddress
Error code
PropertyChangeNotAllowed
Message
Changing property 'linuxConfiguration.ssh.publicKeys' is not allowed.

[VinodVulavakayala]

I am also getting same error

[GitHubAre]

me too

[mazhead]

me three

[MLoughry]

I'm running into the same issue when deploying a brand new VM using a template through the Azure REST API

[EpicApex]

Still getting this issue.

AAD role propagation done[############################################] 100.0000%Operation failed with status: 'Bad Request'. Details: Changing property 'linuxProfile.ssh.publicKeys.keyData' is not allowed.