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The most likely culprit is that the invite was sent to your departmental email account and not to your @ucsb@ucsb.edu account.
Your @ucsb@ucsb.edu account would be:
<UCSBNetID>@ucsb>@ucsb.edu
Solution
Ask the inviter to resend the invite to your @ucsb@ucsb.edu account, giving them the email as:
<UCSBNetID>@ucsb>@ucsb.edu
Your current mail should be receiving the invite.
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