I've been trying to understand how to use textjoin to make this work but I think I need some help.

I want to join all cells in sheets("race").range("AO2:AQ17) to a single cell. So that the output would look the same as the range but within a single cell and with spaces as a delimiter.

This is what the range looks like:
2017-08-19 09_28_57-Javelin.xlsm - Excel.png