I don’t use the command(s) to launch that often so take this with a grain of salt perhaps:
That doesn’t look like the correct command you’d use to activate JupyterLab on the command line. I’d advise looking at other resources beyond what you are consulting. And so if that is the case that wasn’t the right syntax, you aren’t testing whether it was installed or not.
Plus, since Anaconda should have installed Jupyter Notebook, you can look into the commands to launch that as possibilities to try at the Anaconda prompt. Also even though you are at the prompt, it is possible you may need to possibly activate the environment first? (Last suggestion is just an idea from looking around this forum for what others have said.)
I don’t know if you said yet if you are running on Windows or not. If so,…
Further guidance you’ll find if you investigate more troubleshooting steps on this forum is that you need to run things as administrator.
And keep in mind, Anaconda is a company that distributes Jupyter. You may wish to see this post linking to Anaconda support channels that are also available for looking for troubleshooting resources.