Hi @Pradip_Patil,
I suspect that Amazon Aurora PostgreSQL 13 was not available when Camunda 7.17 was released.
The supported versions have passed the test suite successfully.
The latest version (7.20) is compatible with Amazon Aurora PostgreSQL 13/14.
You can test it yourself if a specific version is compatible with a specific database: camunda-bpm-platform/TESTING.md at 15c2cfe122212e8fdfcaf6cf6d24229343fcf1af · camunda/camunda-bpm-platform · GitHub
Hope this helps, Ingo