which node returns path to node, but not if I run in su - user -s /bin/bash -c 'which node'

When I run which node the command works, but if I run su - username -s /bin/bash -c 'which node' it returns empty. I have tried everything under the sun and can not get it to work. I even tried su - username -s /bin/bash -c 'source ~/.bashrc ; which node'

-shellsession
root@vps-151c25b9:~# which node
/root/.nvm/versions/node/v20.18.0/bin/node
root@vps-151c25b9:~# su - username -s /bin/bash -c 'which node'
root@vps-151c25b9:~#
root@vps-151c25b9:~# su - username -s /bin/bash
username@vps-151c25b9:~$ which node
/home/username/.nvm/versions/node/v20.18.0/bin/node
username@vps-151c25b9:~$

What am I doing wrong? Why doesn't node show up when run with su ? **Edit:** I just noticed, when I run

-sh
su - username -s /bin/bash -c "echo $PATH"

I get the path of root, not of the user *username*. Although root also has nvm & node and it doesn't find that either. **Edit 2:** I tried single quotes , so it doesn't expand $PATH and got my correct path including nvm dir:

-sh
su username -c 'echo $PATH'

but when I try

-sh
su username -c 'source ~/.bashrc ; which node'

it still is empty. **Edit 3:** I tried

-sh
su username -c '. ~/.profile ; which which'

(lol) and it returned

/usr/bin/which

, so the command works, just not for node. **Answer:** I ran the following and it worked! I had to load NVM manually.

-shellsession
root@vps-151c25b9:~# su - username -c 'export NVM_DIR="$([ -z "${XDG_CONFIG_HOME-}" ] && printf %s "${HOME}/.nvm" || printf %s "${XDG_CONFIG_HOME}/nvm")" ; [ -s "$NVM_DIR/nvm.sh" ] && \. "$NVM_DIR/nvm.sh" ; which node'
/home/username/.nvm/versions/node/v20.18.0/bin/node

Thank you everyone for your help :)