I'm aware of/that

be aware of + noun
be aware that + clause

✅ We're aware of the importance of this step.
✅ We're aware that this step is crucial.

❌ We're aware of that this step is crucial.  --> We're aware of the fact that this step is crucial.  
❌ We're aware that the importance of thsi step.

be aware of + what/when/where/how/why
✅ We're aware of how time-sensitive this project is.
✅ I'm not aware of what happened.
✅ I'm not aware of when it happened.
✅ I'm not aware of where it happened.