How should the crashkernel parameter be configured for using kdump on Red Hat Enterprise Linux 9 ?

Issue

• When configuring the crashkernel parameter the kdump service fails to start:

# systemctl status kdump.service 
○ kdump.service - Crash recovery kernel arming
     Loaded: loaded (/usr/lib/systemd/system/kdump.service; enabled; vendor preset: enabled)
     Active: inactive (dead)
  Condition: start condition failed at Wed 2022-01-26 23:28:22 IST; 8s ago
             └─ ConditionKernelCommandLine=crashkernel was not met

Jan 26 23:26:16 localhost systemd[1]: Condition check resulted in Crash recovery kernel arming being skipped.
Jan 26 23:28:22 localhost.localdomain systemd[1]: Condition check resulted in Crash recovery kernel arming being skipped.

• What is the correct crashkernel parameter for kdump to work?
• "crashkernel reservation failed - memory is in use" errors when kernel panics