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Each application will have its own unique way of allowing you to configure it, but they will all request the same key pieces of information listed above. The most important steps are to ensure you enter your email address where your email address is requested and your username in the format {username}@mccombs.utexas.edu where your username is requested. Any field called Domain should generally be left blank. Where you are asked for a server name, enter outlook.office365.com. If asked to use SSL security, then do so.
if you configured all of this correctly and it still does not work, try using m.outlook.com as the server name in place of outlook.office365.com.