Using Terraform v0.13.2.
Expected behavior is that changes should be applied to existing workspace but getting internal server error. Running terraform apply through azure DevOps services. On Sep 9 Hashicorp sent an email due to some changes we would have to revoke connection for existing vcs connection and reconnect. I had created a new one instead and updated to use ne oath_vcs_id and tfe token.
Were you able to get a working connection after disconnecting and then reconnecting your workspace?
If not, I would recommend opening up a support ticket and having them look into your connection. https://support.hashicorp.com/hc/en-us