When running argocd CLI, the following warning message shown:

➜ argocd app list
WARN[0000] Failed to invoke grpc call. Use flag --grpc-web in grpc calls. To avoid this warning message, use flag --grpc-web.
NAME  CLUSTER  NAMESPACE  PROJECT  STATUS  HEALTH  SYNCPOLICY  CONDITIONS  REPO  PATH  TARGET

To suppress this warning message, re-run the login with --grpc-web option. For example:

➜ argocd login argocd.apps.tuaf.local.cluster --grpc-web
Username: admin
Password:
'admin:login' logged in successfully
Context 'argocd.apps.tuaf.local.cluster' updated
➜ argocd app list
NAME  CLUSTER  NAMESPACE  PROJECT  STATUS  HEALTH  SYNCPOLICY  CONDITIONS  REPO  PATH  TARGET

Reference: