Custom axis limits on TIMEVALUE data

I  have a stacked bar chart which uses a DAX calculater TIMEVALUE as the x-axis as follows:

StartTimeValue = TIMEVALUE(Meetings[localStartDate])

I have gone into Modelling and set the format of the data to TIME and using format of HH:mm:ss. If I look at the actual data it is displayed correctly.

However, depending on the filters I choose, the x-axis of the stacked bar chart changes based on the distribution of the data. I want to fix the x-axis to a 24-hour period: 00:00:00 -> 23:59:59. If I enter 00:00:00 in the Start box of the X-axis it goes red and is not accepted.

Any ideas on how to do this? What is it actually expecting in that field?

Thanks, Dave