Drop-in Not Detected

Here is the diagnostics, redis host can be seen, but in the connection status – Drop-in Not Installed. What could the problem be? Thank You!

Status: Drop-in not installed
Client: 
Drop-in: Not installed
Disabled: No
PhpRedis: 5.3.4
Predis: Not loaded
Credis: Not loaded
PHP Version: 7.4.23
Plugin Version: 2.0.21
Redis Version: Unknown
Multisite: No
Metrics: Disabled
Metrics recorded: null
Filesystem: Working
WP_REDIS_HOST: "wbex2021redis-001.hmr0qn.0001.apse1.cache.amazonaws.com"
Drop-ins: []