Prosody not adding users

May 08 19:12:52 vid.elsahal.com.ng systemd[1]: Started Prosody XMPP Server.
May 08 19:12:52 vid.elsahal.com.ng prosody[2760009]: **************************
May 08 19:12:52 vid.elsahal.com.ng prosody[2760009]: Prosody was unable to find lua-unbound
May 08 19:12:52 vid.elsahal.com.ng prosody[2760009]: This package can be obtained in the following wa>
May 08 19:12:52 vid.elsahal.com.ng prosody[2760009]:   Debian/Ubuntu | sudo apt install lua-unbound
May 08 19:12:52 vid.elsahal.com.ng prosody[2760009]:        luarocks | luarocks install luaunbound
May 08 19:12:52 vid.elsahal.com.ng prosody[2760009]:          Source | https://www.zash.se/luaunbound>
May 08 19:12:52 vid.elsahal.com.ng prosody[2760009]: Old DNS resolver library will be used
May 08 19:12:52 vid.elsahal.com.ng prosody[2760009]: More help can be found on our website, at https:>
May 08 19:12:52 vid.elsahal.com.ng prosody[2760009]: **************************
comserver@vid:~$ sudo add-apt-repository ppa:code.zash.se/dl/luaunbound
Cannot add PPA: 'ppa:~code.zash.se/dl/luaunbound'.
ERROR: '~code.zash.se' user or team does not exist.

Based on this error, I can't authenticate when I want to create a meeting

Please I need assistance
 

Who told you to run the command "sudo add-apt-repository ppa:code.zash.se/dl/luaunbound"? That command doesn't make sense; anything with the "ppa:" prefix is going to come from Canonical's Launchpad service, not a third-party domain name like "code.zash.se".

The lua-unbound package is in the Ubuntu repository. That means you can just run "sudo apt install lua-unbound", as the output you posted suggests.