Mac SSD Partition Type Incorrect
Here, I assumed "primary drive" meant a drive containing a APFS container from which you boot Mojave.

I have not seen an recent posts referring to asr adjust. There is is no mention of adjust in the man page of asr in both High Sierra or Mojave. I would recommend avoiding the use of undocumented commands when other documented commands can accomplish the same task. In this case, you could have used gpt or the third party command gdisk.

In your case, you are trying to change a value that is already correct. The GUID for a APFS container partition is suppose to be 7C3457EF-0000-11AA-AA11-00306543ECAC.  I assume when you executed diskutil you were booted to either a macOS (OS X) operating system or recovery that was too old to recognize the APFS partition type.

If you wish to boot to macOS Recovery over the Internet, then you should use the key combination Option-⌘-R to boot to the latest version compatible with your Mac. See the  Apple website About macOS Recovery for more information.