Short Answer:
The invite link is invalid or has expired. Click Return to login and ask the inviter to send a new invitation.
Prerequisites
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Access to the original invitation email or the inviter’s contact
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Awareness that invite links can expire (the email states the expiry window)
Steps
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Confirm you’re on the page that says “Oops! This invite link is no longer valid.”
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Click Return to login to leave the invalid-link page.
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Contact the person who invited you and request a new invite.
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When you receive the fresh invite, open it and follow the normal accept flow.
Troubleshooting
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Invite expired after a few days
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LikelyCause: The link exceeded the stated 7-day validity.
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Action: Ask the inviter to resend a new invitation.
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Pasted link is invalid but the email button works
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LikelyCause: The URL was truncated when copied.
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Action: Use the blue Accept invitation button in the email instead of copying the link.
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Invite was already used
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LikelyCause: The token was consumed by a previous acceptance.
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Action: Request a new invitation from the inviter.
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Note: The invalid-invite page explicitly advises requesting a new invite or contacting the person who invited you.