I am experiencing this on ubuntu 20.04 ec2 for both mongodb community edition 4.4 and 5.
Immediately tls parameters are added to /etc/mongod.conf, mongo db stops accepting connections on port 27017. The systemd mongod.service process fails to start.
If tls is taken out of /etc/mongod.conf, the mongod.service is able to start.
Please let me know the commands i can use to get the logs you require for troubleshooting.