terraform-provider-newrelic: Getting timeout error for newrelic monitors

I am running terraform version = 0.12.29. This is the pipeline code I am running:

          terraform init
          terraform validate
          terraform apply -auto-approve -parallelism=4

Initially I didn’t have added parallelism but after going through the ISSUE https://github.com/newrelic/terraform-provider-newrelic/issues/884 I added the flag and checked with the values 2,3,4,7,8,9,10,11,12,20,50 but none work.

Either I receive:

https://synthetics.newrelic.com/synthetics/api/v4/monitors/xxx-xxx-xxx-xxx-xxx giving up after 4 attempt(s)

OR

Error: Validation Error on modules/my_alerts/nrql_monitor/main.tf line 1, in resource "newrelic_nrql_alert_condition" "simple_nrql_monitor_condition":
   1:   resource "newrelic_nrql_alert_condition" "simple_nrql_monitor_condition" {

The above error is 10 times and only for alert.