Guest access in Teams allows a Team Owner to invite a person who does not have a University username to participate in their Team. Please see the tip sheet below for instructions to add a guest to a Team:
Guest Access in Microsoft Teams (PDF 273KB)
When accessing a Teams site via a guest account on an iOS device, you will not be able to edit files using the Office apps (read-only access). You can work around this by opening the Team site in the Safari browser and using the Office web apps to edit files.