Custom Standards in Project Kill HM Linter

We've recently added a custom ruleset in our repository with a custom rule, but the rule is causing HM Linter to fail as it can't find it. I receive the following error when running HM Linter.

`Could not run: ERROR: Referenced sniff "content/mu-plugins/client-phpcs-rules" does not exist`

I have the following line to actually include the rules like such:

```xml

```