Step1: Navigate to the team to which you want to submit a membership request on someone else’s behalf.
Step2: Once on the team, press Spacebar to open the context menu.
Step3: Press the Control+Option+Down arrow key until you hear “Add member,” and press Return. The Add members dialog box opens. The focus is in the text field for new members.
Step4: Start typing the name of the contact for whom you want to submit the membership request. Press the Down arrow key until you hear the name of the contact, and press Return. To add other contacts, repeat this step.
Step5: Once you’ve done, press the Tab key until you hear “Send request,” and press Return.