You need to register "Microsoft.Compute", which is required to create/update SSH keys.
This will help:
https://communities.sas.com/t5/SAS-Viya-on-Microsoft-Azure/How-to-get-support-for-SAS-Viya-on-the-Microsoft-Azure/m-p/946903/emcs_t/S2h8ZW1haWx8Ym9hcmRfc3Vic2NyaXB0aW9ufE0yMlRWNzBTTDRCU1lUfDk0NjkwM3xTVUJTQ1JJUFRJT05TfGhL#M345
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