‘Sorry if you were confused’ places the uncertainty with the recipient. If you sent the wrong time, the clearer apology is: ‘I gave you the wrong meeting time. I’m sorry for the wasted trip.’
A useful apology identifies the action and the effect you know about. It does not need to prove that you are a good person or explain every circumstance before acknowledging the mistake.
Then offer a realistic repair. ‘I’ve corrected the calendar invitation and will confirm the location before you leave next time’ is specific, provided those actions are possible and intended.
If you do not know the full impact, leave room for the person to explain it. Avoid assuming a quick apology means they must immediately feel better or resume the conversation normally.
Context can be relevant, but keep it from replacing responsibility. Being rushed may explain why the error happened. It does not change the fact that the other person received inaccurate information.
Before sending an apology, look for three things: the action you are owning, the impact you are acknowledging and the repair you can make. Remove any sentence that requires the other person to reassure you before those parts have been addressed.