I used
sudo elastic-agent-7.10.1-linux-x86_64/elastic-agent install -f --kibana-url=${KIBANA_URL} --enrollment-token=${ENROLMENT_TOKEN}
to install my linux VM. Note the flag enrollment is misspelt. As youre in beta, you may want to correct this.
Welcome to our community! 
It's valid spelling in the US dictionary, just like using z instead of s for words like analyse/analyze. Historically we've defaulted to the US spelling of words 