Hi @marshallzart
The issue it is showing is your = sign between a Date Comparison and the other side. So can you tell me what the error is there? Its nothing to do with the Option.
However
1. In the first one you typed, you typed [ThisItem.'Project Status'].InReview
What you are doing is trying to use the VALUE of Project status to be the Option Set
Option sets are accessed by using the Global Scoped Format or Local Table Format
so if you look at mine you would have
'Project Status': [@'Project Status'].InReview <=== is essentially a hardcoded value, versus your second one using the Dynamic Value property of a ComboBox.Selected.Value
The [@] Format means, I want to grab the VALUE I am listing from the Option set.
Your second one is perfect because you used the Selected Value and you see its not red because its correct

If I have helped you, I would really appreciate if you please Mark my answer as Resolved/Answered, and give it a thumbs up, so it can help others
Cheers
Thank You
Michael Gernaey MCT | MCSE | MCP | Self-Contractor| Ex-Microsoft
https://gernaeysoftware.com
LinkedIn: https://www.linkedin.com/in/michaelgernaey