When creating 126.96.36.199 RAC CDB on newly created 188.8.131.52 GI/ASM by using DBCA, the database creation failed with errors ORA-19504/.ORA-17502
By checking Oracle metalink, it is an Oracle bug (#21626377) - RDBMS instance fails to identify the required disks to mount a disk group if compatible.asm of the diskgroup is higher than version of the software.
You can refer to the metalink note (Doc ID 21626377.8) for details. There are 2 ways to fix the issue:
1. Apply the BP 184.108.40.206.170418 (or later BPs) - 220.127.116.11.170718 (Jul 2017) Database Patch Set Update (DB PSU) - on Oracle 18.104.22.168 RDBMS home, so DBCA can create 22.214.171.124 database using the ASM diskgroup with compatible.asm set to 12.2.
- Create an ASM diskgroup with compatible.asm set to 12.1 and then try to create the 12.1 database.